Yeah, low likelihood, big damage, interesting analysis, about like any other mega-disaster theory looming these days. Could happen anytime, maybe tomorrow, but maybe not in another 100 to 10,000 years. Sorta like the stories about Mag 9 earthquakes, supervolcanoes, asteroid impacts etc...

Don't know how you can prep for any of these type of events. Like my wife's favorite counter-argument, "you never know..."

Everybody gotta die sometime.