I personally think Furuichi shouldn't change. I know some people may disagree, but he fulfills a necessary supporting role. Furuichi is one of the few non-fighting characters, and the only main one. If his status changes, I would be a little sad.
Not to say that NOTHING can change. I think he and Nenene should start going out. They would be an interesting combination, and I think it would be funny if they still called him Mobicchi.