All the people currently signed up for cryonics but not dead.
An interesting question -- when are cryopreserved people supposed to be revived? Obviously when it becomes possible, but are there any other criteria? Let's say we learned how to unfreeze people but there's no effective immortality in sight (through uploading or biohacking or anything else) -- should they be revived at this point?
That question is relevant here because at the point where effective immortality is possible no one has any reason to sign up for cryonics. Everyone has already uploaded/ascended/whatever, so why would they revive a bunch of frozen primitives?
Let's say we learned how to unfreeze people but there's no effective immortality in sight (through uploading or biohacking or anything else)
I don't think this is realistic. About the only two plausible ways I can think of reviving a cryonics patient are brain uploading and some of the more optimistic projections for nanotechnology, either of which should be sufficient for effective immortality. If there is another proposed method of revival which would not facilitate effective immortality, I am not aware of it.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.