I don't think he's completely wrong. It started as a gamble and from pressure from equality and whatnot.
Now, from a business point, if you have a pretty blonde, English speaking girl that's dominant, sure, easier to Market... And they might do good numbers. Only rousey, cyborg has done that... maybe Holly
But they do poor when wmma is the main event. They can't even promote the best female fighter on the planet, amanda Nunez. Paradoxically, not marketable. But she's way better then rousey.
If the UFC makes an only wmma card... good luck to the UFC. They'll loose money.
I don't know anybody that watches invicta, I've read that it might fold and be taken by the UFC.