#2 We see the Horsewomen
If Shayna Baszler drops the NXT Women's Title on Saturday, the odds of this happening shoot up exponentially. Baszler is legit ready to rise, and some could argue she's even better in the ring than Rousey. With the match now being Charlotte against Ronda, having both iterations of the Horsewomen on tap seems plausible. Odds here are 50/50, partly depending on what happens at TakeOver.
As for why it would make sense? Several reasons really. For one thing, people have been speculating about a match between WWE's Horsewomen and MMA's Horsewomen for a long time. Things heated up when Baszler was in the first Mae Young Classic and her fellow Horsewomen were there to cheer her on, and they happened to bump into Charlotte Flair and her Horsewomen.
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Now with all the MMA Horsewomen under some manner of WWE contract, the match easily can become reality. With Flair and Rousey doing battle, the easy setup is right there, and with WrestleMania right around the corner, setting up a huge tag match does make some sense. However, I think this is still something of a dream scenario. Only two of the MMA Horsewomen (Rousey and Baszler) have had significant in-WWE-ring work. Marina Shafir and Jessamyn Duke are training and did show up on Evolution, but they haven't even worked so much as an NXT TV match yet. I think they could all get involved at some point, but perhaps not yet. It may make more sense for such a mega-tag match to be held off until later in 2019 when everyone is a lot less green.