I liked Plummer a lot as a player and even more as a person. He isn't your typical QB. What QB quits at 33 to play handball?
That said, the offense wasn't doing anything with him there and playing Cutler was the right move at the time. Now with hindsight, I think the Broncos would have been better off getting more help for Plummer after going to the AFCCG than drafting Cutler though, given how Cutler is such a punk.