The Patriots would have never won 2 SB's with DB at the helm. Bradys' play has energized that entire team while Bledsoes' play has deflated the Bills more often than not. There is a reason why the Pats had no qualms about trading Bledsoe within the division.
Once the Bills swung a trade to draft Losman, they basically showed their concern about Bledsoes ability to take this team to the next level. His play has declined rapidly since Nov. 2002 and the future is JP Losman. When he's ready, he'll start and Bledsoes' days in Buffalo will be over. That could happen in the next month.