As much as I enjoy a new job or class like everyone else, I would prefer they give more depth tot he ones we have now. So what is going to happen when there are a lot of classes (we have quite a bit already), well if you are unclear what happens, hop over to World of warcraft. They become impossible to balance out, they are nerfed into simplified mode, and become more and more homogenized where everyone can do the same things, but they swap the names around. Oh wait..that sounds a bit familiar right?

So my answer would be to take what we got, and build depth and make sure they know how to be able to balance more jobs together without butchering the heck out of them. my 2 cents