There's a lot Disney could do to make a regular day in the parks more accessible for everybody, so that fewer people needed accommodations. No, they're not required to do so, but knowing how many guests with disabilities come through their gates every day it seems short-sighted to not even consider that option.
If the standby queues were designed better, and if they were willing to hire enough staff to keep the people in standby from turning into a tightly-packed unruly mob, fewer people would have trouble going through them. I know it wouldn't make them accessible for EVERYBODY, but it would certainly help.
I know people who went during the social distancing period, who said that the standby queues were the most bearable they'd ever experienced. Designing or retrofitting queues without steps, with better lighting, without so many tight switchbacks or uneven flooring, with fewer narrow, closed-in spaces, could help a lot, along with having CMs in queues to keep guests from running around and pushing and crowding each other, and helping people who needed to get out quickly.
I remember back when Radiator Springs Racers was the hot new E-ticket, and Disney was whining about how disabled people were ruining it for everybody by clogging up the Fastpass queue. And then I read that the standby queue wasn't even wheelchair accessible. In the 21st century, KNOWING how many guests a day used the GAC, they CHOSE to build an inaccessible queue and then blamed disabled people for not being able to use it.