The more you learn the more interesting it becomes. Playing with others will keep you interest, for you we always have a feeling of accomplishment. You will be bringing new things to table as others and you will learn from one another. And it's fun!
I personally believe in a lot of theory, a lot of practice, and a lot of fun. If you do not have any one of these (not necessary in that order), the average person will lose interest and never become a good musician.