i think it was more that they were all really big and couldn’t survive a massive resource restriction. we dont have the same problems, being omnivorous generalists who can eat pretty much anything. if something like the asteroid that killed the dinosaurs happened to us a lot of us would die sure, but the species would survive. we could still get power from wind, dams, fossil fuels, and nuclear, and grow food indoors using grow lights. most people wouldnt make it but most likely enough would that wed still have a stable breeding population when the dust settled.