I disagree for a few reasons, some of them already mentioned here.
We needed 14 wins to guarantee HFA.
Momentum.
And finally, Think about it, how many teams in the NFL will ever have the potential or even get a sniff at the oppurtunity that the Patriots are presented with this season. To win the Super Bowl (with one or more losses)would be huge, 4 championships in 7 years, Dynasty !! But to win every game of the season back to back 19-0 that would be truly amazing, historic (16 game season, in this era of free agency).
Sure there is a chance that Brady, Moss or whoever gets hurt.
But if the Pats don't go for it with this team, then we might as well say that they should never go for it and just quit all this talk about winning it all. I say you take your chances and go for it. Some other team in the future will if the Pats don't and I rather see the Pats try to do it first.