Should the Patriots be concerned about their QB situation?

In the AFC East, more then one team has a question regarding their quarterback situation.
The Patriots are the only team with a true and valuable starting QB on their roster -Tom Brady. Behind Brady there are more questions then answers with three untested youngsters in Matt Cassel, Matt Gutierrez and rookie Kevin O’Connell.
The Patriots have had four QBs (ahem – Tom Brady) taking up roster spots in the past, it does not seem likely that 2008 will be the same case. The Patriots will definitely will keep at least one of the backup QBs, but is there a need to keep all of them? Two out of three?
Matt Cassel is in the last year of his rookie contract and has not done enough in college or the NFL to consider him as a potential starter or a true backup which a team would be interested to pursue a trade.
Gutierrez had more playing time then Cassel in 2007 (and also had more time starting in college), so in the current food chain – Gutierrez may be the Matt to remain in the QB rotation or could move to the practice squad depending on the any restrictions for time played or activated for games.
Rookie O’Connell was chosen in the third round and has been highlighted on a few message boards as the future replacement for Tom Brady or at least the first real attempt to find a replacement. So he is a keeper and will not last long enough to be moved to the practice squad. O’Connell was a four year starter (and first year rookie captain) at San Diego State and is probably the