Yeah, I'm not sure I fully agree with RTD here, though I'm not a wheelchair user so don't know how I'd feel if I was. I think this was fine for a pre-accident version of Davros, but I do think that in future appearances he does at least need to keep the scarring/mutated look as it's quite integral to his character and why he created the Daleks in the first place. I think having him able to walk again COULD work, particularly since they could very easily retcon that from his last proper appearance (where he tricked the Doctor into giving him regeneration energy), but if RTD is thinking of just having the version from last night as regular Davros going forward it might be better to just retire the character.