It would be great if Gen Con would step up and give a little more priority to the aged and disabled folks.
Screw that. I don't want priority treatment. I want equal treatment that doesn't penalize me because of my disability and provides accommodations where necessary to put me on equal ground with everyone else. Priority treatment because of my disability is so... demeaning. It's really, really insulting. While they would certainly be more convenient for some people, very few disabilities would require a downtown hotel room to accommodate them. There are accessible transportation options for getting downtown and there are designated quiet areas within the ICC where someone can go sit down, relax, and rest if they need a break from the hustle and bustle of the con. There's a pool of accessible hotel rooms that people with disabilities can participate in if they need to and there are disability services on-site to assist people who need help during the con.
It doesn't affect me either, but it's my understanding that Gen Con goes out of its way to accommodate anyone with a disability.
People who need accommodations should absolutely have priority access to those rooms. What they shouldn't have is priority access to all downtown rooms because they're older or have a disability, which is what it sounded like OP was wanting (I could have misunderstood). That was what I took issue with.
As for the rooms being the last ones to go - isn't that just how normal hotel occupancy works? They make an effort to keep accessible rooms available for people who need them, but if they're booked to capacity, they're booked to capacity. I don't think that's a Gencon thing. I think it's a hotel thing.