Let’s briefly look at the effect on the PLAF/NFL. I will assume here that three million is targeted for 1969 and that the 2nd American Revolution / Civil war doesn’t occur until 1970.
Bad US tactics predominate until 1967, with US forces sopping a lot of casualties that the ARVN did historically. The PLAF cracks in 1967 excepting local force militia (many of whom are tortured to death by US pacification teams.). The NFL manages somewhat better, being fully legitimised but operating at French or even Dutch (yes deliberately) levels of resistance. Systematic crimes against humanity are widespread, more so given the RVN state apparatus is unable to “process” sweeps conducted to a clear status. Thankfully napalm sticks to dead kids and well as it does to the living.
The Duan faction is completely unseated, leading to a reformist northern development line combined with drip feeding PLAF forces into hell in order to keep politics stress on the United States.
The first signs of change come with mutinies in 1967/8 particularly among black front line infantry. I’d probably guess the mutinies are successful by 68-69 as there aren’t state based paramilitary to control the riots and uprising across urban America. As Marines have told me, the outcome largely depends on whether they’re Gung-ho or radical right nationalists in this scenario.
Fewer dead Northern Vietnamese. Less chemical warfare. More dead Americans (clap, accident, opfor). Southern revolution less politically developed but northern Party closer towards Tito (minimum) than historically. Nagy (53) or Nagy (56) is probably the maximum reformism.
Yours,
Sam R.