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.