The fact that WWE and UFC seem to have some bleedover doesn't bother me, as long as the athletes are coming from the WWE to the UFC. I hate to see things happen like Ken Shamrock, Tank Abbot, Don Frye, etc. happen when they become outright entertainers as opposed to, well, gladiators, for lack of a better term.
Anyone who fights in MMA events, large or small, is an entertainer in their own right. They are putting butts in the seats for people to watch them fight. The difference is that MMA is real...WWE is not. Not to mention that the storylines for WWE have become so watered down and craptacular that it's not even worth mentioning...but that's a topic for another thread in another place.
The reason I don't have a problem with athletes that come from the WWE to the UFC....look at Lesnar. He isn't the most technically profound guy, but there is no doubting that he has gotten the job done. I'm not a fan of him, either, so don't get me wrong...but you have to respect someone that is just that big and powerful that he's hard to handle...even if the technique is not there. Not to mention that it really does promote the UFC in a huge way. I also don't see any way that it discredits the UFC, simply because Lesnar does have the ability to win against valid opponents...unlike Kimbo Slice, who was put against less-than-spectacular opponents and set up to win from the start...we all see where that went.
Regarding the possibility of a Lesnar/Fedor fight...that would be pretty cool to see, but then again, just havnig Fedor in the UFC alone would be a great thing, if only for one fight. The heavyweight division is lacking, and putting one of the best, if not the best, heavyweight fighters in the division would really add some life to the division.
I look at it this way...when I used to watch boxing when I was younger, I used to love to watch the heavyweights fight, simply because they were just big guys slugging it out. Not that watching the lower weights wasn't exciting in its own right...but the heavyweights always (for me, anyway) had this "awe factor"....kind of like heavyweight wrestlers had back in the early 80's when pro wrestling was so huge. That's strictly my opinion, and I don't know if anyone else will even know what I'm talking about there...but getting to the point, there aren't that many guys in the heavyweight division in the UFC at this point. It would sure add to it to see someone like Fedor step in the Octagon. I think if that were to happen, we would probably see more heavyweight contenders start to come out of the woodworks...hopefully, valid contenders.
But I think the possibility of Lesnar/Fedor would be huge...although, I'm not sure it should be a title fight...simply because if Mir beats Lesnar, (and I'm hoping he does...sincerely) then that would mean that Fedor would have to fight Mir, which wouldn't be a bad fight either. But I think there would be more of a draw to see Lesnar/Fedor than there would be for Mir/Fedor, because Lesnar just simply is not a likable guy. Mir has his moments of cockiness, but Lesnar just comes across...to me, at least...as thinking that he is unstopable. I would enjoy watching Fedor pound the crap out of him...and make it last as long as possible...just to beat some humility into the guy.
After that, I would love to see Mir/Fedor. Still see Fedor coming out on top of that one, but it would be a more technical fight, IMO, and more enjoyable to watch from a technical standpoint.
Edit: Forgot to mention that Lesnar getting a title shot is just proof that the heavyweight division is severly lacking in valid contenders. How does a guy with what, 4 fights under his belt, get a shot at being "the man to beat"? Obviously a title shot was given based on popularity...which is crap, IMO.