I remember Denver killing the Josh McDaniels experiment a year and a half in. That worked out pretty well for them.
Tanny has been in charge for 7 years. Rex has been coach 4 years. In nfl terms, that is more then enough time.
And after Tanny's 7 years and Rex's 4, this franchise is in the worst shape it has been since Kotite. They have run it into the ground.
End of story. Get rid of both of them.