The only question is whether I want, assuming that I get hit by a bus today, to wake up a hundred years later. And I don't.

This is a really pithy and compelling way of putting this. I definitely have, at a gut level, a desire to wake up tomorrow. But I don't even have at that same gut level a desire to come out of a coma 20 years from now. Cryonics presses my survival instinct even more gently.

(Edit: I see that Bartels made the coma analogy a few comments up. Excuse the redundancy, or take it for emphasis.)