Yeah, but they could add in quests and abilities without a level cap increase, if they wanted to. I'm hoping they will implement Blue Magic as cross-class abilities rewarded through a side-story questline. Maybe increase the cap on cross-class abilities at the same time. That way you could enjoy supplement blue magic abilities that wouldn't need to be shoe-horned into one specific role. The quests could relate to studying monster behavior, and we learn an ability from each monster in the questline.

In the future, when they have quests that lead to new job abilities, I hope that the quests are related to the reward abilities more clearly. Like with summoners, you gain new summons related to the quest you completed (along with an additional ability), but for most jobs the ability has nothing to do with the quest itself.