Its simply a market correction to the knee-jerk post Indy/NE game where the game was overvalued and rejoicing Colts fans were lining up - so to speak.
The line will not move again unless someone tries to pick up a pro and gets arrested or something along those lines. Some places will have 6', others 7 but thats it. Hacks and scalpers who played AFC -4'~6 now realize that the 7' will never come and had to play that weak middle with Chicago +7 or possibly buy up for the hook at double juice.
The total on the other hand is a whole different matter.