In one sentence you say Omertà died with Massino and then you follow it up referencing Nigro and Shots.

The facts are most guys take the pinch.

Even Soldiers (think Nicodemo).

WHY they do it is the question. Rolling still isn't a dream. It means you've lost your whole life up to that point. Now granted it's better than a life bid, but it's no walk in the park either.
Look at how many guys drop out of the WPP.

So whilst the motive to flip is still there it's not completely one sided.