Dump Him or Keep Him?

If you ran the Chicago Bears, would you continue to go with Rex Grossman as your quarterback of the future?
I wouldn't. He can't be good for enough games in a row for the team to be great. And when he's bad, he's so bad, it's almost impossible to win.
I think they need to dump him now, go with Brian Greasy (purposeful) next season and maybe draft a QB.
Injuries, salary cap, dumb luck play too big a role in determining who wins the Super Bowl to allow Rex to keep pissing chances away.
And leading up to the Super Bowl all the media talking heads were praising Lovie Smith for sticking with Grossman. Maybe he made a mistake. Maybe if he had gotten rid of Rex after the Vikings game, Greasy could have come in, got his feet wet and steered this ship to a Super Bowl.