I have to strongly disagree with his opinion here and personally think that the interest in Ronda will only get bigger.
Looking at this from the sports side, fans are always attracted to winners and dominant champions. We have seen this with GSP, Anderson and Jon Jones the longer they stay on top the more success they have in fan interest. Fans will either tune in to see them win or to see them lose and everything in between. You dont have a dominant champion lose interest from fans overtime, it just doesnt work like that. Its a system of those who watched will continue to watch and those who missed out want to join in to see what all the commotion is about.
Now considering the above we have to understand how this happens, its not just a matter of winning simply. The most important part of building a star is marketing and promotion. And if Ronda keeps winning we can sure as hell count on the UFC putting money into her. The UFC really is pretty good at spinning their champs to the mainstream audience when they have a potential star with star qualities. So if Ronda keeps winning, expect more interviews, promos, PR, media, advertising from the UFC's side. And that is not even considering the media and advertising from outside UFC with companies, talk shows, films etc that she will get involved with.
One big quality that Ronda has going for her and this is huge to her success is she is a female fighter. A female fighter in a sport that has been dominated by men in which she is the first true star. Of course, we have seen female athletes come out and get attention in other sports like boxing but they cant get the same attention as the male fighters. Why is that? Lets be honest here and admit that the mass mma audience is really a base that is sold on marketing, promotion and gimmicks and I dont mean that in a bad way in terms of gimmicks. Boxing fans are educated and a fickle audience in a way, mma fans are not. Ronda has the capability to only have male mma fans, but also a whole audience of female mma fans watch that never really existed before.
Now regarding competition and what the writer said. I think that he has a point that competition is important in this case but not in the way exact way he means it. I think if a fighter comes along that will give her a tougher fight, or say a Cyborg moves down and this will be a huge marketing gem for the UFC. These are scenario that will only add to Ronda's interest to something that will already have a big audience to begin with.