While I generally prefer optimism to pessimism, this comment seems horrifyingly accurate. We may escape to new planets, we may learn to live under the sea. Humans will likely persist for a longer time than you suggest here because we're feisty motherfuckers who are programmed to survive.

BUT when you consider how long the lizard kings owned the planet, we are but a drop in the bucket now. The thin veil of oxygen on this planet will shake us like a cold when we use it up. And like an abusive husband, we'll be stuck holding a sad empty hull of defensive behavior and anger that wont bring back ecological balance.