Nevertheless, cryonics is a form of never give up. If this isn't immortalism… However, for strategic reasons, I understand why one might want to stick with the "second shot at life" rationale.

Also, cryonics have to speculate on future technologies: the current ones cannot revive anyone yet. Here I feel a catch22: either you mention specific possibilities, and the dismissal of any one of them could lead to the rejection of cryonics; or you stay vague, and risk being accused of wishful thinking. We may overcome the problem with a well explained disjunctive scenario, though. I hope.