The only reason I see for a 5th match now would be if Pacman got revenge and Maweather stayed unbeaten it would once again become the must see fight for the world again.

The thing every boxing fan was afraid of has happened. Pac vs Mayweather constantly avoiding each other, Pac has now lost twice, once by devastating KO, he has lost his aura of (close to) invincibility. Now there is not so much excitement surrounding the fight.

Oh well it's something the can regret when they are long retired and they realise they could have left a huge historical foot print on the world.