I would definitely like this was well.

They will be out all the time? They already are, just go spend 5 mins in Limsa.
Our characters become superman or an anime character? Because there aren't already more out there mounts than a pair of magic wings. Dragon Ball cloud which is from Mythology to begin with? A flying bed? We have flying Hippos and even a sorta Mech! I don't think wings would be a stretch or too over the top....

Fashion accessories already count as mounts anyway, even the glasses, its why you cant do anything with them you cant do on a mount. Shouldn't take much to translate them into being proper mounts except i guess adding a hover feature when your not flying but running mounted.