If you're not a real chameleon of an actor and if you're not one of those guys who can really shape-change themselves all the time, one of the ways to keep pushing yourself and keep changing is to be in different kinds of movies.
We live in a funny time. If you don't go corporate, you can't compete. You're relegated as irrelevant. People used to admire that.
Sometimes people save the best part of themselves for their art.