I'm in Rhode Island, which is all over the map with Turkey Day. Basically, three types of games going on:
1) For some traditional rivals, they're in the same division, so the Thanksgiving Day game serves as the season ending regular season game every single year. As a result...
2) ... In many cases, playoff seedings are already determined, so it's clear the coaches don't want to show off the whole playback. You'll also have kids with nagging injuries who sit, and although it's a "rivalry" for the folks in the stands, the coaches basically just treat the game like the Colts used to treat Week 17.
3) Some rivals are now in different divisions, which can be good and bad. Some of the "all-time series" records are getting pretty lopsided as a result of fluctuating populations. The two schools I've covered who are next to each other, they finally switched their rivalry to other teams around 2000, I believe, because one school was in Division I (avg. graduating class of about 300 to 400) and the other was in Division III (avg. class of 80 to 100).