I think ZUFFA should try to make as much money off of Rousey while they can.
IMO she's like a supernova, she's shining extremely bright now against her current level of competition, she's extremely marketable and mainstream, but once McMann gets her shot and beats her handedly, I think acting and Hollywood are going to look a helluva lot more promising than training three times a day. I think they'll look to prolong their golden goose and give Zigano the next shot at Rousey instead of McMann and just looking at the WMMA talents that are currently developing/evolving and potential future challengers, I don't think Rousey will be able to keep up. If Cyborg were ever able to make 135, I think Rousey gets dusted quite neatly as well. Not to devalue Rousey's talents here, but I think she gets into deep waters with several fighters going forward.
As it stands, Tate's chances look a little brighter now that Rousey looks to be shooting Expendables 3 prior to their fight, spreading Rousey thinner before the big fight.