Really... any trade today is difficult to improve in net. Teams still have hope, so they are less willing to give up their guys and the rosters they constructed. The ones that don't, you're trading for similarly flawed goalies... like Elvis or Grubi. They could be better, but they're available right now for a reason. It is hard to pry out a young guy who may need a starting net as teams just haven't seen how their year progresses and if they want to move that asset. The proven guys that'll possibly be moved haven't had their teams fall apart.
What we get to is situations like Detroit and Philly... where you might be able to snag a guy they don't feel is their starter, but a NHLer. The Husso/Lyon/Ersson sorts of guys.
Which means the Avs will have to ride this out for a while. George doesn't take losing his net well, so you can't just throw in Annunen quite yet. You have to give George plenty of rope before going to Annunen... but that has to happen if this keeps up. From there you have to wait out teams and their seasons falling apart or a personnel situation to crop up.