I wouldn't trade Jason Campbell for anyone else in the league right now:
Through Campbell's first 16 games as a professional (at the age of 25) has has 3000 yards, 19 TDs, 6.5 average/completion, 13 INTs, 21 Sacks, and a 78.4 rating. When you think what he has had to overcome (inconsistent play by receivers, Al Saunders' offense, Joe Gibbs' conservatism), why would you think someone else could do better under the same circumstances?
Peyton Manning's first 16 games? Favre's first 16 games? His stats compare favorably with those guys.
Tom Brady has had a fine career in a particular system. He wasn't the best Quarterback in football until he got Randy Moss, Wes Welker, Donte Stallworth, etc...
Donovan McNabb? Over-rated... always has been. TO made him look better than he was. McNabb averages getting sacked 30 times a season over his career and has a career completion percentage less than 60% in a West Coast Offense (unheard of)...
Tony Romo? He's never played a game without Terrell Owens. If TO could help provide Donovan McNabb with nearly a 105 quarterback rating in one season (20 points higher than his career rating, including the season with McNabb), then I'm sure Tony Romo is reaping the same benefit. If the TO factor is 20 points, then Tony Romo's career QB rating would be 78.9 (about the same as Campbell, and Campbell is 2 years younger with more physical tools). You ever notice when Tony Romo gets into trouble he throws up a prayer in TOs direction?
Carson Palmer? Injuries? star receivers on both sides of him?
Please... Just look at Jason Campbell... He's 25 years old and there are few (if any) quarterbacks in the league with his combination of physical gifts, abilities (inside and out of the pocket), work ethic and upside. Right now, he isn't someone you trade for anyone.
We just need to get Jason the right tools to work with and build this team around our franchise quarterback instead of worrying how to improve the position.