Nothing is impossible, we even thought in the past that the fight would not happen, but it did happen, so the fact that they have already fought, a rematch is not impossible, probably Mayweather is just looking for the right timing, this is big money, no one would ever resist it.
Makes sense although I hope they could start with it soon since they are already at the same agency, it would not be that hard. But with the pandemic still going around, I think it is better if they could plan this big event in 2022 in which would gather fans viewers that would also generate a lot of profits for Mayweather if he really wants it.
Both understands that a rematch could be their last fight, so if they will agree, they'll make sure there a crowd in an arena as ticket sales plays a major part of the revenue, maybe even higher than the PPV I believe.