In the world of Atlas Shrugged, the key industries were essentially run by their respective heroes. This made it easy, of course, for Galt to know who to watch and who to hep "shrug".

As I mentioned in a recent comment, I'm sure we know enough about the looters to predict and enable them to collapse the failing system. But do we know enough about who would need to shrug? Are we "beyond" the point where a handful, or even a thousand, people are integral enough that if they shrugged it would trigger/advance the collapse?

So I'm wondering: who are some key people that might be "needed" to shrug - not from the pain too view of what the Gulch would need, but to trigger/advance the collapse of the failed system by their absence.