I hope so. I hope he doesn't do a David Duval and disappear from contention.
But I don't think he will. Phil's done a couple of things to his game that will keep him right up there. The first is mechanical. He seems to have much better control of his ball-striking, hitting fairways, stoning the approach shots, and having a good touch with that blade putter. The other is attitudinal. He manages his game and the course well. He's aggressive where he thinks he can get an advantage, but plays conservative when he feels there is more risk than justifies the reward. Hitting shots that take hazards out of play (a three-wood on no. 18, for example, taking the bunkers out of play), hitting into good positions on the greens, taking advantage of breaks (like reading DiMarco's line on the putt at 18). A few strokes here and there saved and/or gained makes all the difference in majors competition. I think he's learned the value of that, and won't waste shots taking chances when there is no reason to do so.
Then again, I'm just a hacker, so what do I know...?