There is another point of view. The Lions are definitely thinking about it, too.
First, the Lions are in the playoffs, and as a wildcard they will play on the road no matter what. Fact is, the #5 seed is always on the road just like the #6 (I can't think of a time when the #5 hosted an NFC Championship Game versus the #6, has it ever happened?). #5 or #6, it really doesn't matter to some coaches. Does it matter to Schartz?
Second, the #5 seed might end up on the road in the elements vs. the Giants. Could be ugly weather in NY in two weeks. Also, the NYG have a lot better defense than NO (assume SF beats STL this week and #6 will therefore play at NO). Stafford might get sacked a lot more at the NYG. Playing the NYG instead of NO might not be as important to Schartz as it is in the minds of some fans.
Third, and most importantly, having no bye week, this fairly meaningless game vs. GB is the only chance for DET to rest its own players. Believe me, Schwartz is considering this fact most of all.
Sure, the Lions might be motivated to win this week to avoid NO and then possibly GB if they advance. That's a valid line of reasoning. Schwartz might feel this way about it.
But maybe, as previous NFL wildcard coaches have done when they were locked into #5 or #6 and didn't prefer one over the other, DET will use this week to rest up and stay healthy for a playoff run. It's possible they'll rest more players than GB.
I guateantee you Schwartz and the Lions would much rather face the Giants than the Saints....the Saints already beat the livin' crap out of Lions...