Also, if your interpretation is correct, by saying that the Earth won't last 100 years he's either admitting defeat (i.e. saying that an uFAI will be built
EY does seem in a darker mood than usual lately, so it wouldn't surprise me to see him implying pessimism about our chances out loud, even if it doesn't go so far as "admitting defeat". I do hope it's just a mood, rather than that he has rationally updated his estimation of our chances of survival to be even lower than they already were. :-)
"The world as we know it" ends if FAI is released into the wild.
Here's the new thread for posting quotes, with the usual rules: