there may soon be 51 stated of America. (Or even more... How will they fit it into the flag?)  I think you just uncovered a key issue that is currently ignored by just about everyone. I’m not aware of any plan to deal with this. You should design a 51 star flag (Puerto Rico), and a 52 star flag (Greenland). Do that and report back. We would love to be the first to see your creative and patriotic contribution.