I agree, Dana is thinking with his penis instead of what's good for business. I honestly think he's just doing this to appease Rousey and bang her on the regular. It sounds messed up, but it's not unreasonable to imagine a man in power like Dana to think this way.
You actually think Dana white would make a decision like this because he wants to bang Rousey. Rhonda is good looking woman, IMO, but I would guess Dana could get much better without having to create a whole new division in the UFC.