This doesn’t effect DOMA. DOMA protects states from OTHER states which institute gay marriage.
If any state court rules that the state must recognize other state’s marriages, then the USSC may have to rule.
How does it not effect DOMA? If gays in CA or MA move to another state which does NOT recognize gay marriage, DOMA gives that state the authority to NOT recognize that gay union. This will be a crucial defense to any equal protection or substantive due process argument.