The Detroit Lions are, very likely, not winning the NFC North. Their reign at the top of the division is probably over after dropping a huge game against the Green Bay Packers on Thanksgiving. It was a must-win for them to remain in that race, and now, they're just fighting to make the postseason in general.
The NFC is extremely strong this year, and they have very tough opponents over the course of the rest of their season in the conference that they'll need to beat to remain in the race. The Los Angeles Rams, Dallas Cowboys, and a final bout against the Chicago Bears in Week 18 all await the Lions.