It's not really up to Mayweather, Bob Arum won't let it happen, period. There was a window for it a few years ago when it was possible for it to happen and this was when it meant a lot as a fight too, the two greatest fighters in the world at the time. Now it's never going to happen is probably pretty meaningless unless Pacquiao can string a few impressive performances together because as it stands he hasn't looked good in about 2 years.