"...the statistical probability of being killed in an accident would approach certainty at that point."
Ah, but that assumes we wouldn't be housed in indestructible bodies in five hundred years.
But logically, we couldn't say more than that we'd live "indefinitely". And unless we can escape to a new universe when this one closes down, we're doomed anyway. Of course we might just be too old to care by the time that happens...
