Indeed.
Here's one for you: There's a 10–15% chance, even barring radical life extension tech, that I'll live long enough to see the moon completely disassembled by von Neumann replicators.
Dismantling the moon would disrupt the Earth's orbit, so the most likely version of this scenario is not beneficial/benign (e.g, grey goo scenario), so you need to factor in the chance that you'll be dissasembled before you see it happen to the moon.
How could you possibly come up with 10-15%?