I definitely would love to see a good pirate themed RPG. Seems like a very under-used setting and lots of potential for some interesting gameplay.
But I would want it to have a strong story and cast of characters. So I would not be interested in an Elder Scrolls-esque open world game. Yes, Skyrim's world is vast, but IMO it's incredibly boring. Skyrim was fun for a few days but then I realized just how repetitive and dull the world was. After I completed the guild quests and killed a couple dragons, I completely lost interest in playing the game. I would prefer a story-driven RPG, but possibly with multiple story paths and endings a la Witcher / Growlanser series.