I haven't been with one therapist long enough to get bored. In fact I seem to unerringly find zany therapists, so it's hard to get bored.

I think therapists get bored, though - I would if I saw a client who was really stuck and showed no interest in unsticking themselves, or who wasn't really doing therapy anymore, just chatting once a week. I think therapists should refer on in those cases, because it suggests the therapist might be part of the problem.