You're right. I was expecting the Dolts to rout the Titans and since they struggled today it has diminished the chance I think they have. But diminshed doesn't mean it's now impossible. Besides, any given Sunday a pro team can beat another pro team (yes, our Chiefs could beat the Pats too. Yes they really could! As you said, the Ravens almost did :) ).
I see the early Vegas lines are calling for the four favorites to win fairly comfortably:
GREENBAY 8 Seattle
NEW ENGLAND 11.5 Jacksonville
INDIANPOLIS 7.5 San Diego
DALLAS 8.5 New York Giants