This would not have been a ruling on homosexual marriage. It would have been a ruling on the restraints of government, specifically the judicial branch of government. They don't get to do the legislating. That's all this was about.
Don't forget who we're talking about right now. It would not be a stretch of the imagination to see this Court simply decide to rule that homosexual marriage is legal in all 50 states. We know there are already enough Justices on the Court to do just that. Better to keep the issue out of the hands of the 6 black robed tyrants that made sodomy a "right".