If the entire universe were turned into a giant computer and did nothing but generate uuids until its heat death, how many bits would you need for the ID space?
"But are you worried that every human on Earth will be hit by a meteorite right now? That probability is also non-zero, yet it is so infinitesimally small that we treat it as an impossibility."
This might be a bad example because one meteorite could take out the world and given enough time is likely to.