Yes. That wont happen (at least not under the Strikeforce or UFC banner).
And why should there be a rematch? Big Foot totally put a beating on Fedor during the second round of their fight and I doubt the 2nd match would be any different.
Fedor at one point is the greatest heavyweight in the World. But he has pass his prime. It is hard for him to deal with the 265 pound monster heavyweight today.