I believe they could but Elune played a part the first time. I am sure they would if the moon goddess thing and well of eternity repeated the event.
DnD djd it with drow turning back into dark elves.
@Fliktarg: I can see your confusion on the issue. Yes there are physical and genetic MARKERS related to that “race”, but those variations are just that, variations within the species. Race as an objective existence just does not exist. On a biological and genetic level, you can have a pattern but it doesnt create a sub species group for a small variation. Its why race doesnt exist, there is no basis for it. I would gladly explaun it in detail, but there are PHDs that do a far better explanation of it which you can find.
Race as we view it, however, just isnt the same as WoW.