Ted Olson has been arguing before the SCOTUS longer than most of the Judges have been on the Court and has forgotten more than they knew to begin with.
This is just “inside baseball” friendly poking one another. Don’t read anything big into this, especially how Scalia felt about Olson’s counter questions.
I can not find anywhere in the Constitution wher it says the court can nullify a legal vote, even though they try sometimes. My guess is that the majority will side with the voters, not the liberal Judges under and on the 9th.
That's the smart money. But I'd further bet that if the court does say it's a matter for states to decide, California will have it back in front of the voters, probably for the 2014 election, and it will pass. Losing to the conservative side of the court will be used as a rallying cry for another effort, with media backing.