The pirate thing can get tedious in AC IV sometimes. the story is becoming more and more useless too as they progress. I hope they move to a new location without pirates in the next game. I don't see much they can add to the pirate stuff. But my gut tells me they'll want to reuse the pirate assets in the next game.
That's what I fear. If they want to get the most out of their ship combat, they should just make a new IP.
I am the Playstation Avenger.