Ever since the first book, I've always seen Daenerys going first to the wall with her dragons and teaming up with Jon to destroy the Others.
Once that's done, head down south to clear out the Lannisters as a combined Daenerys/Night Watch/Stark army - plus allies.
Once that's done, head down south to clear out the Lannisters as a combined Daenerys/Night Watch/Stark army - plus allies.