If stare decisis is the game the homos want to play, they'll lose; Federal courts have decided on numerous occasions that a provision in one state's constitution absolutely trumps another state's statutory permissions, within the former state's jurisdiction. It can hardly be otherwise, for, were it so, any state legislature could void any other state's constitution in whole or in part by merely passing a statute.
The technical term for such an eventuality, given some sort of ex jure barbaro voiding process like this, is chaos.
I agree. However, to compare state sovereignty with homosexual marriage with abortion, is a non-issue. Abortion could easily be determined by the individual states.