for the O6 to go back to the Island, they all had to go together. MIB states they need to be together again to leave.

I think this also applies to the ALT.

Once Desmond restores some Island memory to all of the characters, I think they will all get together to ...?

Possibilities:
- Cross universes to the Island as we've come to know it.
- Raise the sunken Island
- Bring an end to ALT
- Bring an end to Orig. Island and MIB.

Ideas?