I highly doubt it. UFC can't pay Mayweather what he's accustomed to. His last few figts have grossed him 300 million, 100 million in purse money and like 200 million from $100 PPV buys.
The UFC doesn't have the bank for the $100 purse and they won't sell enough PPV's for Floyd to make the other 200 million, I just don't see it happening.
Yes, a Floyd vs. X UFC Main Event would bring in like 5 million buys,but at what price, I doubt $100 - $120 a piece like I am seeing. Floyd's gonna be almost 42 at the time of the fight.
I don't see the UFC putting on a fugazi show, if they did that, it would kill their integrity and make them look like the WWE Minor League. I don't see Floyd fighting for real for way less money and way more risk, just seems silly to me.
Who knows, strangere things have happened but a LEGITIMATE FLOYD MAYWEATHER MMA fight seems very highly unlikely.