Barry Schwartz points to a Twitter response from Cutts to a question about it:
The last update came in early February. Google has typically updated the data about every three or four months. Last year, it was updated four times. Obviously things have changed. Even if it’s not dead, it’s even less useful than before, being updated so infrequently. It might as well be dead.
way on its own or eventually we’ll reach the point where we say, ‘Okay, maintaining this is