Cain Velasquez has 15 fights, and the upcoming Werdum fight will be his 4th rematch.
He also seemingly ruled a division with large dropoffs in ability - it seem from 1 to 2, and then 2 to everyone else.
Anyway, yeah, there probably are some more rematches in Ronda's future, but what are we to do about it really? We can't make the world have more good female 135ers, just like we can't create a bunch of good male HWs under the age of 33.
Ronda's fighting the best in her division, and she's covering a lot more ground than Cain did. The division kind of sucks, true. But what can you do?
Would it be nice if she fought Cyborg? Sure. But I wouldn't go up in weight if I were in her shoes. She's found a good routine where she not only makes weight for every fight, but is able to go and do shit like movies in between fights.