"when its time has come will the United States of America have a "Commonwealth of Nations" type organisation like Great Britain has?"

Sure, Teribus. Its time already came...beginning with the Spanish-American War and on from there. Now its time is running out. They don't call it a "Commonwealth of Nations". They call it something else instead. They already have such a system in place and have been practicing economic colonialism over the whole western hemisphere for a long, long time. The reason they hate Cuba so much is that Castro opted out of that system. Ditto for Chavez. Such nonconformists can expect little mercy from the great colonial power in El Norte.

My country is one of the most fortunate American colonies. We used to be a colony of Great Britain once. Now we are a colony of the USA, and we have not been attacked by it in modern times. I call that fortunate. It's because we cooperate so nicely, and it helps that we speak English too (for the most part).