I hate to break this to you but if you think that the men and even some of the current and former champs are clean than I got a bridge to sell you.
I understand that doping exists, probably in all sports, and at the highest levels. But I also think that there are plenty of clean athletes that excel. And I think there are athletes who make mistakes with supplements and own up to it. And then there are your Lance Armstrongs, your Barry Bonds, and your Cyborgs.
And there is no athlete in men's MMA as toxic as Cyborg.
My main point is that when a professional athlete or professional sport is blatantly indifferent to doping it often causes the public to turn against the athlete or the sport, and that is the risk in letting Cyborg, a blatant and unapologetic doper, compete.
If there were a male MMA champion who, like Cyborg, was clearly doping, was doping so much that he looked 'roided up compared to everyone else, who showed no remorse when caught and instead brushed if off, and instead demanded championship fights, and insisted that clean fighters move to be at his weight class, and if the UFC condoned and accommodated that behaviour, it would tarnish all of men's MMA in exactly the same way. The same considerations apply to the treatment of doping in men's and women's MMA.
In fact, not only is Cyborg unrepentant, she is arrogant. She cheats and then has the nerve to expect that other fighters should move up to her weight class! And let's face it, the higher weight makes it easier for her to dope. So it looks, I think to any reasonable observer, like she is asking the UFC to run women's MMA around her doping. That is some chutzpah. There is no male MMA fighter that has been caught cheating and then displayed such a comedically arrogant attitude. But when we see that attitude from male athletes in other sports, like Lance Armstrong, the public heaps scorn on them. The wider public is not going to take a sport seriously if they tolerate athletes like that.
If you want a sport that appeals to the best and brightest, and to the younger generation, you have to get rid of your Armstrongs, your Bonds, and your Cyborgs. If you want to consign the sport to irrelevance, then yes, encourage athletes like Cyborg.