Here are some things I think DAS can improve upon. First off, DAS has become pretty restrictive and rigid. I'll give you that it does need some flexibility.
It does need to be link to the FP+/MyMagic+ system. And plans were that it will eventually anyways, but it needs to come sooner. All DAS cards come through a FP+ line anyways and those that don't can have mobile touchpoints like an iPod with a reader. The app, kiosk, or website would allow to get a return time without showing up to the attraction and would be based on the current wait which the app also displays and is drawn straight from the source. That alone would do wonder for guests. No having to go to the attraction. More convenience for where you are at, what you are doing, etc. No paper to keep up with, and on the cast members end, no need to have to write anything down, cross anything off, do math, or even worry if someone faked their wait time.
The other thing that I think might be beneficial is similar to what some guests are offered under certain circumstances. Basically, if a guest with a disability has a fixation on a specific ride or rides, I feel like it would be reasonable to allow them to visit that attraction up to 3 times without waiting or getting a return time. It can be in a row or spread out. The guest would have to specify which attraction and it would only be limited to that, but I feel like that is going above and beyond being accommodating and taking in to consideration an exception for a specific fixation. Sure, many will argue that people will simply pick the big name popular attractions or that who's to say that 3 is enough for them. This idea needs to be thought out a lot more, but something to consider. Maybe it just comes down to a guest getting up to 3 extra FP that don't need to be picked or reserved. All they need to do is walk up and scan for them to turn green.
I can also see the 10 mins or less part changing too. I think subtracting 10 mins off the wait time to accommodate for any wait experienced in the FP line is still good, but I think that it is honestly hard for people to find attractions that are 10mins or less in wait time to get "instant access" to where no return time is needed. On a busy day in the park, getting a return time for more than an hour later leaves you scrambling to either use FP+ to get on another attraction with no wait or find something to do in the mean time. Even on a busy day, you are going to find that some typically "low wait" attractions have waits. Sometimes Hall of Presidents, Peoplemover, Carousel of Progress, Tiki Room, Swiss Family Treehouse, & Stitch's Great Escape don't cut it. I do feel bad for people trying to make DAS work for them, but are finding it incredibly hard when it is so crowded at the park. DAS on a busy day really can be a nightmare. I understand that. So, how can things change to take into account park attendance for which attractions allow "instant access" to.
What if DAS was only used at attractions with low capacity, high wait times, or huge popularity? Would it be helpful to say that in the Magic Kingdom you had to get a return time for Buzz, Space, Pooh, Mermaid, Barnstormer, Pan, Mansion, Thunder, Splash, Pirates, and Jungle Cruise? Everything else would give you what you had with GAC. Almost similar to how ticket books were long ago, booklets had few e-tickets which also cost more, but there were also lots of freebies in the park. Each land would have a guaranteed selection to choose from without having to grab return times to help pass time while waiting for those you did have to get a return time for.
Other than the MyMagic+ integrations, the other ideas are extra accommodations that would provide flexibility, but nonetheless, they are still going beyond what they are required to do and treating those with a disability with preferential treatment which really does discriminate against the average park guest. These idea would also be open to abuse and scams as well.
My opinions still rest that while autism is a spectrum disorder, some waiting will have to be done at one of the busiest destinations on the entire planet. Preparing your child prior to arriving can be a key to a successful visit. I don't think it is rude to say that there are some things you just can't do with a given disability. If you can't wait, then maybe a busy theme park full of lines isn't the best choice for a vacation is just as acceptable to say as a person with epilepsy probably should not attend rock concerts with heavy strobe light usage. Same goes for a person who has a heart condition and can't ride Space Mountain. It's just not meant for them. In those cases, as much as it does suck to say it, but you just have to deal with it. It's really tough, but in the end I just really think that Disney will come out on top in this lawsuit, and I really feel like that are very accommodating for guests.