I really don't understand why we're having a debate about it honestly. If Blizzard made such a class, it would probably be the most popular class in WoW, and frankly be one of the most popular classes in the history of RPGs.
And the disgusting thing is that the lore for it is right there. It's not like we're creating anything new here. We see dragons disguising themselves as mortals all the time. You don't even need to make it based on the existing Dragon Flights. Make up an entirely new one, no one would bat an eyelash, they would just be stoked to play as a f------ing dragon!