This is great news for mma and for something different than the ufc.
I've watched them both a little and neither is the 'humble warrior' type (that I personally prefer) in any way shape or form. They both seem narcissistic, talk mainly about themselves and little about the quality of their opponents. Maybe their olympics pedigrees where they were spoiled rotten and got their way all the time from a young age. They both seem primarily interested in making tons of money now no matter who they wreck or insult along the way. It should hype their potential showdown beyond belief.
Don't underestimate traditional promoters' ability to completely ruin the marketing opportunities available to them. One way would be to only have them fight cans who still expose their flaws, then wait way too long & charge too much for a ppv, having completely drained any buildup.
My preference: immediately do a reality show about the buildup to Shields pro debut against, yes, Kayla Harrison. Then another about their rematch. It would bring out so much smack talk and hype and you'd get to know their trainers, their corners, their families etc. Guaranteed it would be a lightning rod of real and imagined drama. Hell, keep it ongoing for their inevitable rematch.
Right now as of this moment Shields acts like it will only take her a few months to 'learn' judo & jiu jitsu - arts that people spend their lives trying to master and still have more to learn. Same goes for Harrison - she seems to think all her striking flaws can just be covered up or papered over because she 'deserves' to be a star. She's already complaining that she's far MORE than 'rousey 2.0'
Sure I'm wildly speculating here. I just think that making them fight first and then again would generate a lot of buzz instead of going through all the tedium of protecting them both from their glaring weaknesses ad nauseum. Harrison acts like she's the entitled one. Shield does the same. Let them at it.
Just a hunch on my part that the entire approach most promoters have is boring. Do the opposite. Like fight circus or anything but the ufc. I guess the tournament format is something different. But what if one gets injured or their flaws exposed of tries holding out for more money or whatever? Too many variables. Since they are both saying they'll whup one another. Let them prove it right out of the gate.
Edited to add: or maybe something like Rizin promos, where you're showing the challenges and hurdles of each fighter without revealing specific training methods. While treating each fighter with respect. Rizin does the best promos anywhere imho!