MMA is basically what pro wrestling would look like if pro wrestling was real. Not that it's a surprise when you see all these lobotomized, mouth-breathing simpletons become fans of the sport.
Look at all the pro wrestling elements that are being interjected into MMA and it's unsurprising that the ones who caught on to this (see: Chael) before others were able to use this into growing their visibility into heights that they never would have been able to before. Hell, McGregor stole Vince's billionaire strut.
Without the pro wrestling element, Chael would have been like Derek Brunson. A guy everyone knows is good, but will end up having a largely forgettable career and nobody will remember him for much of anything.
If you were to ask around people my age (late 20s, early-to-mid 30s) that watched pro wrestling, who were their favorite wrestlers, you'd have a hard time finding people who didn't like Stone Cold Steve Austin. Charisma, anti-authority, his my-way-or-the-highway attitude, those are all things McGregor's taken and used.
If pro wrestling was real and Steve Austin was a real fighter, he & McGregor would be peas in a pod.