Not sure what SCOTUS actually ruled. Did they rule that all States must ALLOW same-sex marriage or did they rule that all states must RECOGNIZE same-sex marriage. The former seems to me to be extreme judicial overreach. Marriage issues have always been controlled by the States. The latter, however, is more in line with established practice.
While this particular issue is probably of little concern to the readers of this blog, the issue of recognition and reciprocity is of serious concern to observant Jews in a very similar matter. First cousin marriages are not unusual in unsere veldt, particularly in Rebbishe families. Such marriages are illegal in 21 states but recognized universally for instance, First cousin marriages are illegal in Nevada but legal in California. Nevertheless, first cousins who were married in California are still recognized as married in Nevada.