The rematch between Holly Holm and Ronda Rousey will be better than Manny Pacquiao and Floyd Mayweather. The audience is already built in and ready to see the rematch, so it will be lucrative for both fighters and promoters. Ronda Rousey's ego was bruised in the first fight so she will have a chip on her shoulder as she attempts to regain her title. The emotion from both fighters will be palpable. I don't watch boxing much anymore but even I will go out of my way to see this one.
This was arguably one of the biggest shockers in MMA history. Most people didn't even know who Holm was, but they surely know Rousey. Rousey was a household name and face and her being beaten was a shocker. A rematch would be a primetime event and would surely be good for the popularity of MMA.
The public would definitely support and watch a rematch. If the two fighters would agree, it would most likely be a bigger fight than the first. Ronda Rousey has such a media storm surrounding her, especially now after her loss to Holly Holm, that a rematch would be good for the public, and the people who profit from it.
Once a person, man or woman, has beat the daylights out of another, or even been on the receiving end of such a beating, why revisit it? There are so very many other people upon whom one can lay blows, let us not dither on revisits and rematches. Throw a punch at a new target.