Statehood is the only option for the future... basically they are a state without title and responsibility. BUT it will NOT be an easy transition: language, customs and general "stuff" are going to be hard but not impossible to integrate into general US rule. For example: CHRISTMAS Nativity scenes in every MALL and in the CITY square: ACLU will have a field day with that! BUT it is cultural as much as religious..
Articles to help you in your °µÍø½ûÇø project in Puerto Rico