Even if it's an exhibition match Mayweather will think twice about facing Pacquiao, but Mayweather is a money man, and if the price is right both fighters might go for it, there is no certainty OP provided in the article, it's 50/50 it depends on the promoters who can push this, both fighters are still not retiring on fighting in the ring although its only for exhibition, there's a big possibility that they will agree to fight if both fighters need money, Pacquiao who run and loss on election spend a lot of money so he needs a big fight, Mayweather is spending a lot and he has a lot of people to give salary.
We'll see if there's development but right now its all speculation.
Pacquiao needs to train harder this time, as in their last face-off, it was Mayweather who dominated the fight, resulting in a unanimous decision win for him. While this upcoming fight may be just an exhibition, I'm very certain that the potential revenue generated from it could surpass that of many professional fights today. It's entirely possible that both fighters could make $10 million or more easily.
Consider this: the Paul Brothers, who aren't as legitimate boxers as Pacquiao and Mayweather, have generated massive amounts of money in their boxing careers. Given the fanbase and reputation of Pacquiao and Mayweather, it's likely that this exhibition will be a financial success, potentially surpassing than any big professional fights in boxing this year.