Although I highly doubt it will get that contentious I am also of the mindset that if he finishes among the top 10 QBs, including 3500 yards and 24 tds, it is very unlikely he will even go into next season without an extension, maybe even spurred on by the Bills.
BTW, that doesn't mean he gets a 6 year, 60 million dollar deal. personally, I'm thinking it will be a 5 year, 30 million dollar deal, with incentives.
Again, just a guess.