Hopefully, in ten years MMA will be legal (amateur and pro) in every U.S state. There are many where it isn't legal still (California is a big one) and, I hope to see it become legal.
Also, like other people have stated, I think there will be higher caliber fighters. Hopefully it can be where kids can start MMA at a young age just like they can do with Taekwondo and Karate. If that catches on, the quality of fighters will increase since they have been training significantly longer.
I don't think there will be another big company (like UFC or Pride FC), but I do think that the smaller ones will start making it difficult for the UFC and Pride FC to keep the whole market share. In ten years, I'd hope to see a regular cable show (I know there are certain things on Thursdays on Spike) that doesn't just rebroadcast PPV fights (it is nice though) but has regular fights on that program, maybe from people the specific organization wouldn't put in a PPV but still want to give that fighter a chance to show the world what they have.
A thing that would be neat is the woman's sector of MMA getting more exposure. Up until BodogMMA, I didn't even know there were woman who did this. So, more exposure for them would be great.
I'm also for the higher pay too. The pro fighters spend countless hours in the gym and they don't really get paid well (at least that's what I have heard about the UFC). They should be able to support themselves but still train as hard as they can to make the fights more enjoyable for the fans.