I think a good way to look at this is to evaluate the roster under contract in a 3 year window (can't really plan much beyond that). Including 2012 in that window, we need to look at the roster under contract for 2014. Not next year, but the year after that.
Offense (15)
QB Brady, Mallett
RB Ridley, Vereen, Bolden, Demps
WR Lloyd
TE Gronkowski, Hernandez, Fells
OT Solder, Cannon, Zusevics
OG/C Mankins, Connolly
Defense (11)
DT Wilfork
DE Jones, Francis, Bequette
LB Mayo, Hightower
CB Dennard, Dowling
S McCourty, Gregory, Wilson
ST (3)
ST Gostkowski, Slater, Ebner
It is pretty amazing that the Pats could field a team and be championship caliber with just players under contract 2 years in the future. I believe they would also have enough cap space ($20M+) if they want to re-sign some of Welker, Edelman, Woody, Vollmer, Talib, Spikes, Ninko, etc. and/or add some mid-level FAs.
Add to that 6 day 1/2 draft picks and the next few peak-Brady years are indeed bright. When you consider that the only key player on this roster that will consider retirement by 2014 is Branch, the Pats really have reset the entire team before our eyes while staying a Super Bowl favorite.