Hold on. The Broncos have a winning record and still have a shot at division title but they are considering putting in a rookie like Cutler for their final push in December?
What does this say about Plummer?

Shanahan has had to tone down the aggressiveness of his play-calls out of fear that Plummer will make more mistakes. He certainly has made enough of them this season, throwing 11 interceptions compared to 10 touchdowns.
Two Sundays ago against the Raiders, Plummer threw three interceptions, causing the Broncos to continue contemplating a quarterback change. In Denver's next game, Plummer played even more poorly, throwing an interception and fumbling twice in the fourth quarter, including once after the Broncos called timeout to go over their play-call.
Ouch.