Of course a guy can come in & rebuild in less than 3 years! All the Bills need to win are a QB & a competent coaching staff. Select the right coach & QB, re-sign the key free agents and this team is a winner next season. Stay the course with Gailey & Fitzpatrick & we're a loser again. This is the 21st century-rookie QBs come in and teams go from losers to winners the very next season-just look at what a new coach & QB are doing in Indy & the coach has been ill virtually the whole season. Look at the recent 1 season turn arounds & wake up to this 3 year nonsense:
2012 Colts: New coach, new rookie QB: 2-14 in 2011, playoffs 2012
2012 Rams: New coach, same QB but not injured for 6 games, 2011 2-14, 2012 5-6-1 so far, major improvement
2011 49ers: New coach, same QB, 2010 6-10, 2011 13-3 makes it all the way to NFC championship game
2011 Broncos: New coach, new starting QB, 2010 4-12, 2011 8-8 win division & playoff game, show enough to attract P. Manning 1 year later and are now Super Bowl contenders in coach's 2nd year.
2008 Dolphins: New coach, new QB (veteran), 2007 1-15, 2008 11-5 win division
2008 Ravens: New coach, new rookie QB, 2007 5-11, 2008 11-5, playoffs & with the coach & QB they've been contenders ever since the change.
I could go on, but I think my point about the 3 year nonsense is proven, and if you still have any doubts that you can turn a team around in far less than 3 years, then explain how 2 expansion teams in 1995 made it to the conference championship games in 1996.
Now look at Bills history with coaches 3 years or less on the job. Do you really think more time would have helped: Williams, Bullough, Stephenson, Ringo, Johnson, Rauch, Collier and Ramsey? About the only guy you could make a case for is Mularkey & he quit. All the others never got another NFL HC gig again.