Disney will do something about this, but it will ultimately come down to the enforcement of the front-line cast members. I posted the huge GAC card thread about the committee that is in place to discuss GAC card use, abuse, and possible changes that can be made to still provide such amazing services for guests with disabilities, but cut down on the abuse and the "instant unlimited Fastpass" idea that is associated with it.
One issue is the current black market selling, trading, and transfering of GAC cards. You can find these for sale on the black market. Some are in great condition, others have been altered to be valid. Disney is working on legal wording to be added to the cards that is not currently in place to state that they are non-transferable and not for sale. This is more of a legal deterrent than anything so if someone is caught, the person in question can't use the loop hole that there was nothing saying they couldn't. In addition, GAC cards may also be changing in style, color, etc to also prevent fakes.
This segues into the next problem that people know what they look like and know what to ask for. By changing colors and styles, guests can't simply ask for a "red card" anymore. The current stamp set may not be getting changed, but proper training of Guest Relations cast look for specific keywords may also help in the long run. Right now, from my basic understand (so I could be wrong), anyone that comes in speaking of autism, anxiety attacks, claustrophobia, physical outbursts in confined settings, and physical conditions that resulted in limited amounts of standing and even sitting, will result in the coveted "Alternative Entrance" which is where the abuse primarily is. Many of these conditions and disabilities should be accommodated, but the current method is result in a similar experience that a Fastpass ticket provides which isn't always immediate boarding, but does result in a minimal wait. Many of these conditions could have alternate wait times provided instead with return times specific to a Fastpass return time. The virtual wait time would be there, the same rules as a Fastpass would be there, and the level of accommodation would still be there.
Another issue that is comes up with abuse spans across both proper usage of the GAC card and those who abuse it. Currently, GAC cards allow for repeat rides. So if group A could technically ride Space Mountain over and over and over again. While they may or may not have a real disability for which the card was issued, it still wouldn't stop them from doing this if they wanted. One change being discussed is placing a limit on repeat visits. My best guess is that it will be limited to repeat visits in a short period of time similar to how entering the park with your ticket works. (For those not aware, if you enter the park, leave and attempt to enter again, the system will know and block you from entering for a certain time period. This prevents people from passing tickets across the gate... or lack of one now.) How I envision this working is each card having an RFID in it that would register if the card was used within a certain amount of minutes of riding the same attraction. This would still allow guests to experience the same attraction multiple times a day similar to any regular guest, but cut down on the abuse of the system.
Last but not least and one of the major issues with abuse is the front-line cast members are not enforcing current procedures either because of lack of knowledge or care, large influx of crowds don't allow for cast to check each card throughly, and exceptions being made by those that issue and those that grant access. Enforcing the number of people the card is issued for is one big problem. The cards are designed to help the person with the special need and up to 5 guests, however Guest Relations is known for putting numbers greater than 6 on cards. Sometimes two cards are issued to the same group due to multiple special needs guests or because parties do exceed the amount the card is designed for. Front-line attraction cast members also send some stamps that are required to wait in regular lines through an alternate entrance or Fastpass queue. In the video from the Today Show, the GAC card that is shown shows the stamp of a "wheelchair". Many attractions have wheelchair accessible queues such as Buzz Lightyear's Space Ranger Spin, Soarin', and Rock n' Roller Coaster. An alternative entrance or access to the Fastpass line is not needed but sometimes cast members will incorrectly send them through because they either forgot or don't care. Other attractions that do not have wheelchair accessible stand-by lines do have different procedures. Lines like Toy Story Midway Mania, Space Mountain, and Big Thunder Mountain all have stairs in their primary queues. Depending on the attraction, specific wheelchair queues, return time cards, or alternate boarding procedures take place. Sometimes what looks like "skipping the line" results in a longer boarding process than the line would take based on specific ride vehicle capcity or specific loading procedures. Finally, there are some attractions that do not have fair systems in place due to their design, age, or boarding process. At Disneyland, many attractions where built prior to ADA laws and have little or no room to make physical accommodations resulting in similar backdoor or exit gate entrances. So proper enforcement of the stamps, dates, party size, and who the card is issued to are major problems on Disney's side that need to be addressed.
Disney does know the abuse is happening and knew about it prior to these undercover investigations and news reports. Since the Fastpass enforcement times in Spring 2012, leaders and Fastpass+ number crunchers started to become very interested on what traffic is using the Fastpass Return Lines. They cut out the return time abuse immediately, but still see large numbers of GAC cards arrive through these Fastpass queues that do throw off the carefully calculated ratios of Fastpass to Standby guests. At some locations, data on how many GAC cards coming through has been monitored.
Overall, Disney will do something about it, but it will ultimately fall in the hands of your lower paid, basic trained front-line cast member. The abuse is terrible especially for those who do need this service to better enjoy their day. Unfortunately, news stories like this can make the matter worse. Guests will be quick to judge non-apparent conditions like autism that may result in special needs groups feeling looked down upon. Guests may also end up looking into ways to take advantage of this problem opening it up for more abuse. Unfortunately, the moral values of society as a whole have deteriorated quite a bit over the years. I can only hope that these cheaters, abusers, low-lifes will get what's coming to them sooner rather than later.