Yeah, the suspensions are imposed by the Athletic Commission mainly to keep fighters who have been knocked out from sustaining further damage by fighting again too soon. This is also the case in boxing. It's a really good thing to do for the protection of the athletes.
I'm going to chime in with an opinion about the Chuck/Tito rematch. I think the ending of this fight demonstrated the need to get rid of the cage. I have no argument with the timing of the stoppage under UFC rules. I do however think that Tito was absolutely capable of continuing. He was covering up and Chucks punches were landing on his arms and shoulders. He was just up against the cage and couldn't maneuver to change positions. If that fight had been in a ring (as in Pride) they could have stopped the action, moved the fight to the center of the ring and restarted in the same position. Chuck may have stopped the fight just the same but Tito would have had an opportunity to try to scramble for better position. I think that would be better for the fighters and ultimately for the fans as well. Trying to watch a fight through chain link fence is difficult in person.
Rampage's entry into the UFC will be interesting. My only concern about him fighting Chuck is the fact that Rampage has been brutally knocked out twice since the first time they fought (Wanderlei Silva twice and Mauricio Rua) while Chuck has taken relatively little damage. Getting knocked out sometimes damages a fighter and Rampage isn't as aggressive as he once was.
Mirko should rule the UFC heavyweight division for as long as he wants to. He has been caught and stopped before (Kevin Randleman) but his striking is far superior to what the UFC currently has to offer and his ground game is pretty good and he takedown defence is excellent.