Throw in the other counterfactual scenario, which is no US involvement in Vietnam post WWII at all, not much of a war, and thus far less incentive for reprisals, and the installment of leader who was always populist nationalist first and Marxist-sympathiser second and actually had good relations with the US in the immediate aftermath of WWII. Also probably no Communist coup in Laos, and a slim chance of stability in Cambodia.

The ironic thing about Vietnam is that culturally it's still one of the most capitalist countries on earth.