Didn't... EVERYONE was figuring Reaper was the next job?

There was theories about it since Ran'jit transformed himself against Thancred, so 2019.

Necromancer was a popular demand aswell but how to fit it in the lore, making it a neutral job and moraly acceptable?
Well summon a pet that looks like a lich/ghost from the void. But that wouldn't be a Necromancer anymore! Boom, Reaper.

It's all cute and all but don't worry, Reaper/Necromancer/Void Mage was expected by many for long.