There will always be stuff to learn. Techniques, genres, songs...it will never end. Beyond that, personal interests change, players can get on a 'kick' and have a new favorite and then move on to another.

There are two things I try to do...first and foremost is study and practice to boost my chops. Everybody has to have the ability to play and that comes from getting basics down and always working to improve those playing skills. The second is I practice a little of everything. I don't devote my practice time to just one thing...I work on drills and technique/genre lessons and songs. For [u]me[/u], it keeps things fresh and fun and helps when one thing is overly frustrating/hard. On the other hand, I have to be careful to not scatter my practice and not make meaningful improvement. It's all not easy but it's not impossible either.

Learning guitar and songs only stops when the player stops, otherwise, the road is unending. So too is the fun.