When actors get pigeonholed, that's their own doing to a large degree. Because if you do something that people like, obviously they're going to ask you to do it again. It's up to you to say no. If you're that insecure about working, you'll probably do what you're known to do.
“What is required from members of Congress and the public alike is a new spirit of devotion to the national welfare beyond party or self-interest.”