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.
“Pear Drops were exciting because they had a dangerous taste. All of us were warned against eating them, and the result was that we ate them more than ever.”
“Ignorance of what real learning is, and a consequent suspicion of it; materialism, and a consequent intellectual laxity, both of these have done destructive work in the colleges.”