The problem is you're posting these bullets without a thoughtful explanation. You're going to need a fragmentation of the internet to truly stamp out diversity and multiculturalism. Why you would want to do that? I don't know, but good luck with embracing non-existent cultural purity.
I'll pick on the "less invasive nations" part which is wishful thinking. If you have America or any multilateral global order among democracies, you're more likely to have nations trying to get away with what they can with their neighbors. Russia's invasion of Ukraine is the most recent glaring example of this, except the responsive was unexpected by many. We only have all of human history of empires and warring countries as examples. This doesn't result in a balanced less polarized global equilibrium. Less cooperation among countries would be worse for the environment even if you ignore the war aspect.
I'll pick on the "less invasive nations" part which is wishful thinking. If you have America or any multilateral global order among democracies, you're more likely to have nations trying to get away with what they can with their neighbors. Russia's invasion of Ukraine is the most recent glaring example of this, except the responsive was unexpected by many. We only have all of human history of empires and warring countries as examples. This doesn't result in a balanced less polarized global equilibrium. Less cooperation among countries would be worse for the environment even if you ignore the war aspect.