Think of the hole which you would have if you lost Larkin. Arguably two of the hardest positions to find a young stud in: C and RHD. That should tell you how willing the Jets are to move Trouba.
Trouba fills our needs so unbelievably well that there's nothing to gain from trading him. He's the one who will take over when Buff starts to lose his step. He's the one who plays the hard minutes, both with the worst teammates and against tougher opposition. If you take him away, we don't have a replacement for him. We'd turn out to be just like you are now in a couple of years.
The Nyquist+Smith+stuff offer is insulting, as it fills absolutely zero needs of ours. On the other hand, someone said that we aren't getting Ristolainen or Lindholm. That is exactly why we won't win if we trade Trouba: the only way we could ever benefit from trading him would be if we upgraded him.
So, to sum it up, the Red Wings don't have the assets which they would give up, and the Jets aren't willing to trade Trouba.