UFC doesn't necessarily do great on TV and it's been in a state of decline for a solid 8 years minus Ronda and Conner. They haven't created new stars to replace the guys that made them popular to begin with.
But to be fair, Ronda, Conor, GSP...they reached such a huge amount of popularity that trying to annoint any fighter the next Ronda, the next Conor and the next GSP would be setting them up for failure. I don't know if they'll ever have someone reaching that level. Can we put Demetrius Johnson being on the cusp of that category? Can Justin Gaethje reach that level should he continue down his path? Who knows.
But to corroborate wht Jmare said, I was also surprised that FOX now seems to be fully on-board with WWE, and I actually like the idea of a possible revival of Talking Smack on FS1. I'm curious to know how much they'll follow through with all those promises though.