This all could easily change.<quoted text>
The issue is not "marriage", the issue is the definition of "marriage". In not ONE instance has the SCOTUS ever claimed anything other than the Union of a man and a woman to be a marriage. Could that definition change? Sure, but the question we really should ask ourselves is- do we want a federal court which lacks the authority of the Constitution to define marriage to make that decision?
Remember, they are also going to hear the DOMA case, which specifically was decided based on the premise that the regulation and definition of marriage rested with the State.
Remember Einstein....once women could not vote. Injustices against an American's liberties will be looked over.