The fate of humans is extinction, saying otherwise is simply wrong. Be it 200 years or 2,000,000,000 at some point our species will go extinct, or whatever species we evolve into. I understand why people get angry when you say it, but anger won’t change it because on a long enough time scale nothing will survive.
Still, I think the question on people's minds is whether it's 2 Billion years, 200 years, or - if the US and Russia play their nuke cards - maybe less :-(