Well since both of them are experts and famous on their respective fields, I am pretty sure that the market for this kind of fight is relatively huge.

Floyd Mayweather is all about money. Anything that gives him more money (i.e. exhibition fights, etc.) would most probably be his priority in the upcoming years. I think I also stumbled upon his upcoming fight with Logan Paul (although suspended and moved to an indefinite date) but imagine fighting these amateurs and earning millions in return. Dude even if I was in his position, I would probably do the same thing.