TUF is done. Season 28 will be its last.
The show was great in the beginning and produced a lot of great talent, but it's run its course. The last few seasons have been weak, even when they've tried different themes (crowning a champion, flyweight contender, redemption, undefeated).
At least they're building out women's featherweight and heavyweight to close down the show.
Hopefully there'll be a great "best of special" to finish up the franchise.