Sometimes, the smaller roles in movies can be the most interesting. If you only take the stance that you'll only play central characters in movies, you'll find yourself not being able to indulge in that morally grey terrain that makes support characters so rich and interesting.
The secret of the truly successful, I believe, is that they learned very early in life how not to be busy. They saw through that adage, repeated to me so often in childhood, that anything worth doing is worth doing well.