Let's wait and see how this fit goes first. I think Rondo will be able to be a good fit in Dallas, but he WILL HAVE TO ADAPT. He can't dominate the ball nearly as much as he did here, and that will be a hard habit for him to break. Alot of Dallas writers/fans have strongly mixed feelings about his fit and capability of adapting to Dallas. I think it eventually works out, but, just like the Cavs, let's them play a game together first before exalting them.
EDIT: And it will be interesting to see how a Rondo/Ellis backcourt works defensively. If Rondo doesn't get back to his defensive roots, he'll be ate up by the elite PGs out West. Maybe his lessened offensive role will let him get back to defense.