The point is that the gradient of discontent is no longer as harsh in the western direction, and that the OP theorizes that this is a reason for the decreasing share of the productivity growth focused in the West/US.

There is some empirical evidence for those theories. The US and the West in general have profited of disruptions they caused or partially helped, from scuttling research projects using political pressure and then hiring the researchers into the US up to arming rebellions and indeed military intervention.