By request of the community, an Open Thread for free-form comments, so long as they're still related to the basic project of this blog.
A word on post requests: You're free to ask, but the authors can't commit to posting on requested topics - it's hard enough to do the ones we have in mind already.
Mark, alarmingly high? I don't see how that probability can be calculated as any higher than the existential threat of quantum flux or other simple, random end to our apparent reality, but I'd be interested in seeing the paper.