yeah you could just make walkways big enough to have a car on them and have the car go slow around crowds. universities do this for disabled people all the time. you only need a couple of these sorts of cars and they have a system setup so that there is next to zero wait time for them.

and a lot of walkways are like, shattered / old in the usa so a lot of wheelchair users have to make entire new (longer) routes in a wheelchair to go the distance. though i do think most forms of disability can be covered by wheelchairs, some edge cases might necessitate a car. cant think of any off the top of my head but there are a couple of brutal skin diseases that require extremely gentle care that not even a wheelchair could provide, and probably not a car with current infrastructure due to the bumpy ride. maybe a super fancy wheelchair with shock absorption and a way to protect from the sun could do it