I think it might be still be possible, just a lot less likely.
I believe Seattle can win this game, but then have to lose out.
If SF wins it's over.
Yeah I guess if anyone in our division wins we have no chance of winning the division.
If someone in the division wins, say the Seahawks, they would have to lose out and so would the lions for us to have a wild card. In that scenario the div champs would be AZ, GB, DAL/PHI, (and whoever wins the south). Wildcards would be DAL/PHI and the Rams having the tie breaker over DET and SEA for having the best division record.
It would also mean that the niners couldn't win more than 2 games, we're gonna have a better div record than them no matter what if we win out.
So basically, root against SEA, SF, and DET.