I agree they're painfully thin on assets up front (beyond Crosby, Malkin, Staal). Malkin is for sure done this season, and reports are saying Crosby could be back in 2 weeks or he could be out the rest of the season. Pittsburgh is still holding on strong to a playoff spot (4th overall, 12 points ahead of 9th), but things could change in the coming weeks. I think that Pittsburgh is still holding onto hope that Crosby will be back at somepoint this season, if not then playoffs, so if they are fighting for their lives come deadline day I'd think Shero would try to make a move to keep his team's playoff picture alive. They have a lot of options out there for wingers (Versteeg, Penner, Hemsky, Kovalev etc) that can be had for picks and prospects (in penner and hemsky's case a defensmen.
If Crosby is done for the year, then yea I agree that they'll bascially shut everything down.