He wouldn't be responsible. PG choose him, so the buck would stop with the person who made the decision to entrust the family jewels to someone else. And of course Sam would not be happy to be at the helm but the other thing is that over time the market changes so we wouldn't know for sure if it wouldn't have gone down even if PG were still around. [1]

[1] Noting General Electric, Jeffrey Immelt, Jack Welsh and the collapse of the financial system that led to getting rid of finance as a profit center.