Kidding aside, Curse wasn't too bad, but it wasn't where the original creator(s) intended to go with the story.
And now that Disney owns LucasArts, chances of them supporting a franchise that conflicts with their own Pirates of the Caribbean (one of the inspirations for Monkey Island in the first place) are slim indeed. :(
How come there haven't even been any other games (that I can recall right now) based on pirates and voodoo and traveling between different islands?