I think they should make some more serious changes. Totally change the format as it's gotten a bit stale. Get rid of the secluded can't leave the house, no TV, no books, stuff. Less douchebags trashing the house. Maybe go back to two weight classes. I think you could get overall quality of fighter with only 8 guys from each weight class, rather than 16 guys. Some of those bottom 8 are awful.
Maybe rotate in more guest coaches. That way, fans get to know more of the current top fighters that aren't household names like Liddell and Couture.
Maybe try something like, Brazil vs. USA. Brazilians with Brazilians coaching them, like Shogun, Wandy, or Anderson. USA the same. It would require some subtitles for the Brazilians, but as is, the show is only for people that speak English. Which is a shame given the quality fighters from other countries, particularly Brazil.