I tend to agree with the thread title, but not for the reasons stated in the post.
Here's my thinking:
a) Rondo is going to hit unrestricted free agency. That's something he has admitted that he is looking forward to, a lot.
b) When Rondo hits free agency, he's going to sign with a team that already has the pieces in place to win a lot of games and make noise in the playoffs.
c) The Celtics, in my opinion, are very unlikely to be in that position. Therefore, I'm not optimistic about Rondo re-signing in Boston.