The export key should be returning on the 26th of March.
Keep in mind that it was only absent from the US Store and not the European Store.
Is Nickleback a song listed for Rock Band? If so then I would buy it. I already have the PS MOVE!
I think you'll be happy to see that Nickelback has a good amount of tracks to purchase on the Rock Band platform.
If that link doesn't work well, here's a list of the songs available:
- Burn It to the Ground
- Figured You Out
- How You Remind Me
- If Today Was Your Last Day
- Never Again
- This Afternoon
- This Means War
All songs can be purchased via the PlayStation Store.