Three Choices for Puerto Rico
I cannot fathom allowing the Greece of the western hemisphere into the US. It will just be one endless economic tragedy after another. On the other hand I am amenable to permanent full free trade as if a state, easy border and no visa necessary entry, and prompt access to green cards, or other work permits for residents.
I cannot see how Commonwealth status can succeed, nor can I see statehood. Looks like independence is the name of the game. Do it quickly. Add a strong dose of financial help with the crisis as a door prize for promptly leaving.