I think there is a very valid reason to believe the pats can go 16-0, and even 19-0.
1. The patriots already won 3 superbowls, and they were pretty much really close to going to the sb last year, if it wasnt for a few miscues. in a certain point during that run they won 20-something games in a row so 19 is certainly feasible for this squad
2. on top on that they have Moss, Maroney (Morris if he gets injured), stallworth, welker, etc...the list just goes on and on.
2. They are doing this without Harrison or Seymour, two pro bowl players
3. they have a personal motivation to win and prove themselves
and as someone said, when you win superbowls and then you lose, it just makes you want one even more
so i think they can do it, its all about keeping focus