I think so. Look at Kevin Kolb...
2010 season: 7 games, 7 TD, 7 INT, 60.9 completion %, 6.3 YPA
The result: Arizona traded their most promising DB and a 2nd round pick AND extended Kolb's contract by 5 years, $63 million.
For whatever reason, there's a major dearth of QB talent around the league. Fitz would get paid the big bucks.