#1 The payoff
Let's be honest here.
The WWE Universe wants to see Ronda Rousey whip Nikki Bella's ass and show The Fearless one why she made a mistake by crossing her. It's basically the same thing they did with Alexa Bliss and Ronda Rousey at Summerslam, but with, more of an underlining generational theme.
With that being said, WWE could also really elevate the match and the eventual beatdown by putting a stipulation on it, which will only serve to give Rousey an arsenal to unload on Bella with. Maybe Bella can get some shots in too and even get some help from her sister Brie, thus helping to make the match more believable!
Of course, fans can feel free to disagree, but watching Nikki Bella get whooped by Bella, especially after all the trash talking on Raw, is going to be a television-worthy event. In the end, Bella is the kind of heel that the fans love to hate and just the thought of her humiliating Nikki is enough to drive fans to watch this pay per view.