Yeah, it was hard to see Thanos as the "ultimate" villain considering I agree very much with his philosophy. Just not his execution. If I got to make the call, I institute a one child policy per couple for the next 3 generations. After you have a child, male or female, you get sterilized. Anyone who wants to make the choice to go childless can go ahead and do so. I'd also institute energy rations and end the production of most of the useless stuff. There's other stuff I'd ration too. There would be conservation measures, particularly for water.