Just because no one's making, that doesn't mean there's no market for it. There's just been no pirate game in recent years that's every stayed a float. The only other one I can think of is the one for PotC: AWE, so yeah. A looooong time ago and done awfully. But ACIII and IV both showed that people love it. I expect Rogue will do the same.
Well there's that mmo, but I don't really think that needs to be mentioned.