Would the state 'Pacifica' even be that realistic of a proposition. I don't know how the residents of these territories would feel about being lumped together like that.
Doubtful they would want to be lumped together, since with the exception of the Northern Marianas, the former Trust Territory of the Pacific Islands chose to head off in the direction of independence once the trust territory was ended. I'm just saying that a Pacifica as I outlined is likely the only way of Guam has of ever becoming a State or a portion of a State, and even then, that would likely happen only if the Senate were eliminated or its power was severely curtailed.