I don't think so, simply because of the way he phrases it and the timeline. There's no way Hawking would predict such a huge natural disaster in the next 1000 y

I don't think so, simply because of the way he phrases it and the timeline. There's no way Hawking would predict such a huge natural disaster in the next 1000 years, let alone in the next 100 years with such certainty. I think it's clear he's talking about man-made disasters which have already been set in play (like global warming, overpopulation, war, etc.).