I think you guys are thinking about this all wrong. You are all missing the potential of this thread. If this movie actually gets greenlit then let's have a little fun with it in the mean time.
Knowing Ronda, who hates every woman who isn't her mother, sis, or friends, how bad will those poor girls playing her opponents look. Think of the exaggeration of her already ridiculous dominance on screen.
Then there's the casting. If Ronda will play herself and produce this, who can you think of will portray those in the book, primarily those in the UFC? Think of the possibilities. Imagine what crude casting choice they'd make for Cyborg and how cowardly she is. Meisha being played by some plastic, big titted bimbo and being slaughtered in either/or both fights. Dana White maybe played by Joe Rogan just for the shits and giggles. This could ultimately end up being a disasterpiece.