NINJA and ROGUE confirmed

[Nalien]

And then there's this. Not one class is tossed aside at level 30. Using your Bard example, without the archer's foundation the Bard would just be three songs, a song buff and an AoE attack. Classes aren't tossed aside, they are buffed by the equipping of the Job stones because that's all the Jobs are, special equipment that grant enhanced stats and expanded abilities at the cost of the class' multi-classing. Ninja will be no different, it's nothing without rogue providing a foundation.

How often do you see Archers in instances after 30? What about Gladiators, or Lancers? PvP is literally the only place Classes can shine, and even then that's just Gladiator and Marauder.

Classes may as well be their Jobs once you hit 30, Rouge and Ninja should be no different. Rouge could be a proxy for Thief, but if you're playing Ninja, you certainly aren't playing Thief. Last I checked Thief didn't do crazy hand signs and spit ice, at least.

So, Thief either is Rouge, and it's gone after 30, or Thief is a Job at some point. For it not to happen at all just contradicts the implementation of Jobs at all.