Also, here's a blog post I wrote a while back about the games combining.
I'm not into Assassin's Creed but the Black Flag ship combat looked pretty good, so add that to a TES game and i'd be interested (and the armor is pretty cool).
No, I wouldn't. But as Azura said, the ship combat would be pretty neat. They'd have to find a way to have it make sense, having an option to operate a ship randomly is unrealistic without being apart of that lifestyle in-game.