It just seems kind of oddly discontinuous to care about what happens to your analogues except death. I mention comas only in an attempt to construct a least convenient possible world with which to challenge your quantum immortalist position. I mean---are you okay with your scientist-stage-magician wiping out 99.999% of your analogues, as long as one copy of you exists somewhere? But decoherence is continuous: what does it even mean, to speak of exactly one copy of you? Cf. Nick Bostrom's "Quantity of Experience" (PDF).