Not really. It would just make it easier for rats to take over. Small animals would quickly get back to the old numbers, but bigger predators in the ecosystem might not recover. So if Thanos plan was for cockroaches and rats to rule the world, well then maybe.
Americans love to pretend they are cowboys. In reality they love centralised power and bureaucracy. They are deeply afraid of each other so they flock to platforms that pretend to be for freedom, but is actually highly regulated by centralised power. That’s why they love tech-oligarchs that pretend to be self made geniuses. It allows them to fantasise about freedom to succeed and submit to power at the same time.