Had he still had a points cushion, then playing percentages and playing the long game might still have worked, but now he has to go for it.
There was a comment a while back in Autosport that was intriguing, by Mark Webber. He said that Fernando wasn't very tough, and was very predictable - and you always knew what Fernando would do, and the column moved on to say that Mark was perhaps alluding to Alonso being a percentage player.
IMO he's been consistent, but to be consistent you're either going to have to be in the lead (like Vettel) or be a bit of a percentage player, a la Button. A bit of gung ho-ness is definitely going to be lost.