That was a quite interesting read. It was a good thing to point out that Daredevil and Charles Xavier can't really be considered disabled, because their special powers overcompensate. I hadn't really thought about it, but it is true.
However, I am with Gumboot for the most part. I any kind of action/adventure oriented kind of genre, a disability can create too many problems and limitations. Unless the author can work it well into the story (Tyrion Lannister) so that the character can play the role unhindered, it can really complicate things.
Actually, I think Stannis Baratheon shows some Asperger personality tendencies (though probably not full syndrome), with rigid thinking and lacking social graces. I have no idea whether that was intentional on George R. R. Martin's part, but it is possible.
There is also the danger of belittling the problems faced by a disabled person if they can perform anything a normal person could, in fiction. I think there is a worrisome tendency to take certain disabilities too lightly, to expect the individual to overcome them (in order to not burden society with too great extra cost, says my somewhat cynical analysis)*. Therefore, I think a disabled person performing amazing feats in fiction could actually do more harm than good, to real disabled people, by furthering such an agenda. Sorry, it seems diversity of representation is not neccessarily good. Unfortunately, I see that having role models could be a double-edged sword for disabled people.
* Let us just say I do have some reliable input on what disability means, in real life.