I dont think its that bad. Universal is $75 a day for ONE park, and $95 a day for BOTH parks.
Now if I were to guess that if people were only at Disney for one day, they'd go to the Magic Kingdom. The Magic Kingdom has somewhere between 35-40 attractions.
The problem is that Disney considers everything that isn't a restaurant or shop an attraction, and is really misleading by public perception. Mots people in the public wouldn't consider parades or fireworks shows a "countable" attraction, nor do they count lining up in a tent to meet Mickey Mouse an attraction...but Disney does. The public usually defines an attraction as a ride of some kind...in which case Disney would have 28 (including animatronic shows).
But let's say your comparison works with the Magic Kingdom. It won't work if your example changes to the other three parks instead. If you want to do more than 1 park at Disney in one day you have to add the hopper...which is $50.00. So it's $130 for two or more parks at Disney. Now you can argue that four parks for $130 is better than two parks at $96, I would argue that the other three parks don't offer enough additional attractions to get the value, nor is it really possible to do the four parks in a day without skipping a good portion of those attractions.
The Six Flags park I worked at has 35 major rides, not including small kiddie rides...and is HALF the cost of admission to Disney. While it isn't Disney, these aren't cheap carnival rides either. I didn't include parades, shows, or meet-n-greets.
I definitely find the better value at Six Flags...but unlike Disney, Six Flags isn't marketing destination travelers.
Now if you went to Universal for a day and spent $95 for both parks, you're only getting around 36 attractions.
Basically the number of attractions is the same but you're paying about $15 more for a day at both parks at Universal than a day at the Magic Kingdom.
So honestly, Disney is still the cheeper choice if people are having a deciding factor to spend either a day at Universal or a day at Disney. Now obviously it changes if you go to a different Disney park but you get the point I'm making.
But another factor you ignore is the type of attractions as well. While some people think the themeing alone is enough to justifies Disney's prices, others will say the overall experience should be the total factor. If you were to take any one of Disney's well-themed attractions such as Pirates or the Haunted Mansion and stick them AS IS in a Six Flags park, I guarantee that those rides would be a walk-on after the first or second seaon never to see a long line again. What works for one park doesn't work for another.
I don't think raising the prices will hurt people going to Disney, especially when comparing them to their biggest competitor.
My question is and will always be: how much money does Disney lose (i.e., not get) from day travelers who don't see Disney as a bargain, but who might see Universal as a better bargain? Disney should offer two types of one day tickets: an un-upgradeable 1-day admission for two parks at $80.00. It would attract day-travelers but also would prevent people from upgrading this ticket to try and save money.
So honestly its a win-win for Disney. People aren't going to want to pay higher prices for only a day, so they'll stay longer. And if they do the math and decide between Universal and Disney to spend only one day at, they'll learn that Disney is the cheaper route. *Again if they chose to spend their one day at the Magic Kingdom, which I believe the majority would.
You're making a broad assumption though that a day traveler would find the attractions at Disney better than those at Universal. I've known many people that prefer the nature of Universal's (and Six Flags for that matter) to be better than Disney's. While Disney does have a few food thrill rides, a lot of people find Disney mostly for kids.
The issue isn't even so much value, but greed. Disney raise prices every year, despite rarely adding anything "new" (and refurbs don't count since Disney should be maintaining what they have on a regular basis anyways). And the fact is the prices go into effect when a good number of attractions are closed, so people are getting less value for their money. Someone who goes in January is getting a lot less for their money than someone who will go in June.