This just a thought but seeing as Tales of Monkey Island didn't feature the mentioned island which it's name is featured in the title and only the last four had Monkey Island, what if the next game in the series (hopefully there will be one) didn't have said name in it's title?
Just like how the latest Tomb Raider game was called "Lara Croft and the Guardian of Light", this could be the same with the next game if said island isn't featured.
If so what do you think it would be called?
Eg. "The Legend of Guybrush Threepwood", "Savior of the Carribean: Tale of Guybrush Threepwood"