Not so sure the 2011 Colts would agree wtih you on that one, in today's league you need depth at all positions becuase guys just aren't allowed to play with injuries like they used to be able to.
Maybe not, but I will am pretty sure the 1999 through 2010 Colts would agree with me on this one. Who over a period of 12 years went 138 wins, 54 losses...won 10 or more games 11 years, went to the playoffs 11 years, won a Super Bowl and went to another.
And I am pretty sure that had nothing to do with depth at the QB position.
Outside of backups that turned out to be "elite" HOF QBs (Brady and Warner) when was the last time a team lost their starter and a backup led that team to a Super Bowl?
Here is the list of starting QBs over the past 20 years that won the Super Bowl:
E. Manning, Rodgers, Brees, Roethlisberger, E. Manning, P. Manning, Roethlisberger, Brady, Brady, B. Johnson, Brady, Dilfer, Warner, Elway, Elway, Favre, Aikman, Young, Aikman, Aikman.
All these teams had nothing to do with having depth at QB. The only two teams who didn't have a HOF or future HOF QB was Johnson (who threw 22 TD 6 int the year TB won the SB) and Dilfer, but both of the those teams had the #1 defense in the NFL that year.
Championship teams are built around elite QBs who are healthy, not teams with QB depth. The rare exception are teams that are so good on defense they can overcome mediocre QB play (Dilfer), but that is the rare exception and not the norm.