Signing staal long term also eliminates a place for Skjei to play.
Very doubtful he gets an extension.
No, it really doesn't. Skjei can take the third pair spot if and when he proves he's ready for the NHL. IF another rookie takes it this year, perhaps that rookie could then move up and then Staal could be traded. I personally think it'd be very dumb and risky to trade Staal, a "sure thing" in the sense that he's clearly a second pairing NHL d man, if not more, to make room for a prospect who is going back to school this year, and isn't even pro yet.
I'd say it's very doubtful that he doesn't get an extension. This D is a disaster without him. Hardly NHL grade IMO.
Also, Staal and/or Allen could move to the other side. I believe Allen plays both in the A, and Staal would be worth exploring on the other side in that situation IMO. Either way, it'd be a good problem to have, not the kind of problem you move players to avoid.