That's an interesting point. I am signed up for cryonics, but I'm actually rather ambivalent about my life. One major wrinkle is that, if cryonics does succeed, it would almost certainly have to be in a scenario where aging was solved by necessary precursor technologies. For me, a large chunk of my ambivalence is simply the anticipated decline in health as I age. By the same token, existential risks that might prevent me from, for instance, living from age 75 to age 85 tend not to worry me much.