While it's a delicate topic, I don't think it makes for a proper representation, because in a setting where medicine can cure any ailment that makes wheelchairs a necessity in today's world, the only one who would need them in setting are those who those who actively refuse treatment. It represents only those who chose to be in a wheelchair, a situation with little to no bearing on the situation of real life people with disabilities. Some are indeed embracing their situation as a part of their identity, but it's quite offensive to assume it is the case of everyone. The political reaction, in setting, to people with disabilities (ie, in setting, who chose to stay affected by them) would also lead to societies with little to no compassion toward disabilities ("if you chose not to accept treatment, your loss!"). It might also logically lead to social and political environment actively hostile to people outside the norm unless, in setting, there is a valid, socially accepted reason to refuse treatment. I'd be wary of including people with disabilities in a setting where the disabilities can be cured at will, because their situation can't be properly and respectfully depicted unless a great deal of tought is devoted to make sure it's the case. One of the way I can think of is if the treatment is reserved to the rich, but that is a very stringent restriction on political systems in the society the characters are in.