I want Pac to win too, but unfortunately it's not the most likely scenario.
FM is basically an act, I wouldn't take anything he says seriously as his only motive is $$$.
They were schedule to fight this May and it went sideways when FM insisted on Olympic style drug testing and Pac refused. I've got mixed emotions about this whole issue. I think Sugar Shane Mosely's poor performance may have been related to him not being able to take steriods and he had a serious decline in performance. But given that he's 38 perhaps father time caught up with him. But I think it's the boxing commissions who should determine the drug testing policy and not individual fighters.
That said if they ever got into the ring together, I'd be routing for Pac. The only problem is that if he wins, people are going to be saying that he's better than Duran, hell they're already saying that which is ludicrous. But if Floyd wins, they'll pretty much be saying the same thing. These are great, great fighters, but they're not in the level of Duran, Sugar Ray Leonard, or Sugar Ray Robinson. But they could end up making Top 20 in terms of all time great and the winner of this fight will certainly have a higher claim than the loser, especially if it's Floyd Mayweather, who will still remain undefeated.