This happens every year. The ML will probably go off with NE -190 or something like that in Vegas. Not sure about offshore, but Vegas is overrun by people that bet the favorite on the spread and the dog on the money line. If the game ends up being a close win for the Pats the house will clean up. The Rams win a few years back was a bonanza too as many people pushed on the Rams, but lost on the Titans on the ML. When the favorite covers or the dog wins outright Vegas doesn't do as well, but they could have a bonanza this year if the Pats win by a FG.
The squares do bet the favorite more than not, but those that are inclined to bet the dog will usually get swayed by those odds and overbet that. This is the one game where sharp action just can't match what will flow in on the game from the public so don't even try to read any line moves or setups as moves by sharps, they will just be pure floods of public action.