I think the thing that attracts me most to brewing is the art of the craft. It's learning your equipment, ingredients and techniques and fine tuning them to constantly make small improvements on your beer. If I ever reached a point where there was not something more to learn, a new toy to buy or a new process to master I'd probably get board and take up square dancing.
So my point is, stick with it. Small fine turning over years and years is what makes you into a master craftsman. And the more you learn the more you learn there is more to learn.