That's an option, but they don't uniformly want it. The residents of PR have been net migrating to the mainland for 50 years and they prefer that option.Release them to self rule.
I've gotten a pretty good education on PR recently. It could be a national gem, but it's so poorly managed and stuck in the past. Really a shame. It seems people crave the idea of visiting Cuba. There is no way Cuba has anything that PR doesn't, shy of 1950s cars.
Originally, PR was the center of commerce in the entire Caribbean and Central American trades routes. That's long over. It was then considered a key outpost to protect the mainland during WWII. That's no longer necessary. We used some of it for naval gunnery practice for years, but they kicked them out. They pay no federal income taxes, but they receive extraordinary financial support and everyone is asking the other guy how we got in this pickle. There is a way to a real tourist treasure there, but they can't get out of their own way.