First, LL capacity is absolutely a finite resource— there have been dozens of reports of people who generally cannot ride certain rides (Test Track and Peter Pan are the most common culprits, but it happens at many other rides on a less predictable basis) even with DAS because lightening lanes stretch 30+ minutes. Total ride capacity is limited as well but harder to explain to people who don’t want to understand it.
I (think I am) agreeing with
@Chi84 and
@flynnibus (but I also like to talk)— I think the current DAS overhaul focusing primarily on children who cannot handle waits at all, along with AQR for prior users (presumably including me), is far better than the hypothetical alternative of saying “all disabilities qualify but we can only allow 5-10% of LL capacity to go to DAS and we will distribute it first come first serve” (or even worse, randomly such that you don’t know you have it until the week/day of)—but there is a non-trivial chance it won’t ultimately work for Disney.
If even half of the outright fakers (and the prior users who believe they are still entitled to it become fakers) all mysteriously start having at least 25% of their family/group becoming severely autistic and knowing exactly what to say to get it, Disney is going to be back to having an unworkable system. Even if Disney could legally ask for documentation (which is far far from certain, and would likely benefit their wealthy guests at the expense of the less privileged), they don’t want to be in the game of determining if one kid with autism is really “autistic enough” to qualify more than another, or trying to weed out which doctors notes are coming from medical mills, etc. At that point, they might say “we tried our best to cut back to focus on families who truly most needed DAS but we still don’t have adequate capacity, so starting [in a month or two, knowing Disney] we will be offering [some number of] individuals with a qualifying disability the ability to request DAS system accommodations each day” or they might not limit DAS access but suddenly it would start to look more like Genie+, with per ride capacity limited and return times that vanish before noon, or they might just get rid of it entirely and use more flexible AQR instead.
It wouldn’t surprise me if Disney and Universal are both currently lobbying to try to get clarification for what percentage of attraction fast pass capacity they must give to disabled guests, now that they have a friendly state government.
