I'm way too late to this party, so two cents.
One, in principle, all fantasies are correct, none are immoral. Everybody's fantasy is okay. It doesn't matter if your fantasy is just vanilla status-quo preserving and even regressive/exclusionary. This isn't -or at least shouldn't be- a moral failing. And holding these fantasies shouldn't be held against anybody.
However, the moment more people get involved things have to change. When it isn't just about yourself, you need to adapt and be aware of your effect on others. And this compounds the more people are involved. The more public and high profile the bigger the moral imperative to be welcoming and inclusive. And well, resenting the existence of these miniatures is stupid. If anything, there aren't enough of them.
Personally, I can see a place for these in say, public pick up games. Less so in some personal games, because I enjoy a certain architecture style heavily based on basements and staircases and open forested mountain areas as locations. But on the other kind of adventure I enjoy, which is intrigue heavy and more urban based, a PC in a wheelchair would be very welcome and hardly impeded. Even in environments which aren't suitable for a wheelchair, there are alternatives, from the more fantastical (the floating disk thing) to the more mundane (riding a big dog, or being in a basket carried by a big and strong party member)
However, I would prefer a wheelchair style that looked far less modern.