I'm signed up for cryonics, and I believe you're leaving out two crucial motivations for cryonics. These are not particularly smart reasons. You don't logic your way into them. But they are emotionally strong reasons, and emotions are the primary motivators of humans.

The first is that it reduces my fear of death significantly. Perhaps unreasonably so? But the fear of death had been a problem for me for a long time, and now not as much.

The second is that I want OTHERS to be frozen for MY sake. I want to see my parents and brothers and friends again in this iteration. In typical coordination problem solutions, I should also freeze myself for their sake.

There's also the fact that I think it may be a good idea to maximize the number of people in any particular world like me, and this is one way of doing that. But that's not really emotionally motivating, just an abstract thought.