Concerned about what? TUF has been going down the drain for awhile now, IMO. I don't see how Fox could ruin it anymore.
Hopefully Fox doesn't go the route spike went and put people on the show for ratings. I'd like to see them make an effort to find legitimate competitors.
I can't see this happening, at least not at the beginning. They're going to need to attract a stable audience at first, just to ensure it's worth their while financially. Once they actually turn a profit on showing TUF then they might begin to work hard at actually producing talent for the UFC