Maybe, but look at the Genie Warlock. It's basically four different subclasses in one depending on which Genie type you pick.Yeah, clerics and wizards are wildly over-represented in the 2014 PHB. That said, I think a single specialist subclass for wizard would end up being a cheat, and effectively be nine subclasses anyway.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.