Asking if 2 out 3 is acceptable after you have already won 2 games is kind of pointless.
The NE game is going to be a measuring stick, but definitely not a must win game. If NYG lose tonight the Bears will have a 3 game lead on the entire NFC with head to head tie breaker advantages against (NYG and SEA).
After the NE game, the Bears have (MIN, at STL, TB, at DET, and GB) with a combined 17-33 record. The Bears should win all of those games, but it seems like NE will be their last true test.
I think they will come out and treat the game like a playoff game.
The Bears will clinch a playoff berth with probably one more win, and home field advantage with 2 more wins.