My opinion on this fight first of all...
Conor McGregor has NO CHANCE at beating Floyd Mayweather at boxing
Whether Conor McGregor knows it or not, he is being paid to lose a boxing match. This payment will be very big, possibly $100 million for him win or lose. So it appears to be a win win situation for Conor McGregor.
Floyd Mayweather is in an exhibition fight which could be worth $1 billion
This is nothing more an an exhibition match similar to Ali vs Inaki. But this will be a fun exhibition match and because it will be fun people will pay to see it. It is not going to effect the legacy of Mayweather and I'm not even sure if the fight will be in the official rankings, but it will be entertaining I think and will make a lot of money.