#2. There is no longer the same demand
Conor McGregor's bout with Floyd Mayweather was a monumental event worldwide that had fans everywhere tuning in. They were the best and most popular fighters from the world of MMA and boxing, facing off against each other in a once-in-a-lifetime bout fans had never seen before.
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Were they to fight a second time, none of this would be true. McGregor is on a losing streak in MMA, and Mayweather has retired from professional boxing. Most importantly, we've already seen how this fight played out. and that bout did not have many desperate to see a rematch.
The same could be said of any opponent promoters could put up against McGregor in a boxing ring at this point. There is simply much less interest in watching him fight in the boxing ring than there will be in MMA, where there are a ton of interesting match-ups for him. McGregor has built his career off thrilling fans, and unfortunately, no boxing bout can do that at this stage.
#1. He's an MMA fighter
The entire conversation surrounding McGregor boils down to the fact that, by trade, he is an MMA fighter, rather than a boxer. As fun as his first venture into the world of boxing was, there is no need to once again have him try his hand at a sport he is very clearly less skilled at.
Conor McGregor was (and may still be) one of the greatest MMA fighters of the modern era. He captured the imaginations of fans everywhere and became a global superstar in the process. He can still do that, but he would have to be competing at the highest level — therefore, MMA seems to be the only option.
Conor McGregor could still give so much to the sport of MMA. He's only 34-years-old, and there are a wealth of great match-ups for him. Seeing him return to the UFC would be incredible, so it would be great if he dedicated himself fully to the sport rather than entertaining more boxing fights.