There will be no statehood.
Back when the US had something to gain by having PR on the side (as if she is a mistress) they blotted out anyone (Albizu) who stood for independence. Now you don't think they will do the same with someone who is for statehood, given the ramifications and the power that "Estado de Puerto Rico" would have? Like someone else said in another thread, this isn't like Hawaii. Besides, the sangre africano that most boricuas have won't allow for permissiveness like the Hawaiians have if PR were to become a state.

I'm getting ahead of myself, because I don't believe it will ever happen. If it does not benefit the gringoes' pockets, best believe PR will never become a state. She will probably be cut off like the girl you're dating who you just found out had an STD before she would be granted indepedence and much less statehood.