I could see some dlc adding multiplayer functionality to these naval battles. I think that would be awesome! Either versus, co-op or both... I'd be happy either way. Some things would have to be tweaked here and there for balance, but I think it could work.
"You know, if you have the aptitude, you should join the Mage's College in Winterhold."
*Has Aptitude. Joins Mage's college*
"You know, if you..."
*Becomes Arch-Mage of Mage's college*