Bananas has said he’s done (for now). He’s proven himself multiple times over and is hosting some new shows. CT is in a similar boat, where he’s trying to move beyond the game (he’s actually getting into acting with “
The Most Dangerous Game” coming out fairly soon). He also has CJ (his kid), who he hates spending so much time away from for the show.
For a while, the old guard has been on their way out and MTV has been struggling to fill the vacuum with new stars. It’s been pretty obvious they want it to be Josh, Fessy, and Kaycee , but they all keep getting into their own way and haven’t been as interesting in The Challenge as they are in Big Brother.
My gut says a big reason for Challenge USA NOT having a bunch of vets is an attempt to create new stars without the pressure of playing against old ones (which is a completely different monster). Rookies are always expected to run a gauntlet to prove themselves, and only rarely stick around long enough to establish themselves. Getting rid of that aspect, and essentially creating a Fresh Meat season, allows new blood to become known (then get annihilated when they play the real Challenge… like what happened to Lolo).