Anyone remember back when Yoshi-P talked about introducing Advance Class/Jobs as a future content during a interview back in 2.0 era and he used the example.....

Red Mage may require Black Mage and White Mage?

Guess I'm the only one that remembers.

Anyways we may obtain Advance class/jobs eventually but right now we have no confirmation on where ROgue/Ninja stands. Only speculations.