Iim sure Martinez would the chance to avenge his defeat and Margarito would love a crack at the 160 Title. Bob Arum could make this happen
If PW will win over Cintron, a PW/Martinez rematch will be a classic. Their 1st round in that first fight is classic. Though you have a valid point. I could imagine Arum's thoughts thinking the same, selling the fight as a revenge of Martinez is a good way of unleashing Margo. Then selling the fight to the hispanic market - for his pocket's sake.
Margarito will have to show he deserves such a fight first. I think Martinez could take him. He is a lot stronger and a lot more experienced now. Remember he started boxing at 20y/o. The first time they fought Martinez was still learning. It could be a very nice fight. I think Margarito can adapt better than Kelly.
If Margo wins his next fight and the Mayweather/Pac doesn't happen expect a Margarito vs. Pac :verysad :-( just because of Arum's arrogant ass! But don't expect any PPV records cause the fans will be pissed! I for sure won't even bother seen it.