Chris Johnson was fantastic against Houston. By the end of the game, he'd rushed for 127 yards and a touchdown and caught three passes for another 14 yards.
Along the way, he also picked up multiple first downs in difficult situations, rushing well between the tackles and along the edge.
He was great.
That said, Johnson's overall season has not been great, and a great rushing performance when the playoffs are no longer attainable doesn't really help the team all that much.
If he'd played like that all season, he'd have a case for a paycheck the size of a quarterback's, but he didn't. Johnson is paid to go out and play like an elite player every game, and he isn't doing that.
Freeing up the cap space that Johnson creates would also allow the Titans to be more aggressive in free agency and get players at other positions that need improvement.
So, even with a great performance against the Texans, I think Chris Johnson's time with the Titans is done.