They didn't have to convince Johnny Depp to do the second and third one he even said himself that he had seperation anxiety with Captain Jack Sparrow. My guess is that there will be a fourth, they made so much money that it would be stupid not to do one. I also think that it will be about aqua de vida and fighting over the Black Pearl. I think they will.
Johnny depp Loves being Sparrow so I am pretty sure he's in...