Bad argument. Not only is it unsupported, their race is playable through the blood elves. We have seen numerous races being prevalent in the game despite not being playable.
Who are barely ever around.
Whose playable race is the trolls.
Who are prevalent across multiple expansions.
The hozen have been prevalent across multiple areas since their appearance in MoP and they are not playable including the Jinyu, and the Ankoan. There are multiple races who are not playable despite being repeatedly present including mur'locs. The argument of "they aren't prevalent because they aren't playable" is an argument with no basis.
Cease the hyperbole, it does not favor your argument.
Address my argument above Aldo. The argument of them not being playable and therefore, not being present does not work given many races such as goblins and worgens were not playable but were very prevalent before being playable.
What would you like me to call you Aldo? That is the name you chose, so I am not sure why this annoys you so much.