Cryonics does not stand alone. It is the backstop in a wider movement to extend healthy human life.
The first line of effort is living well now: the ordinary, evidence-based habits that add healthy years, plus advances in medicine that keep pushing lifespan upward. Beyond that lies serious research into the biology of aging, with the long-term aim of slowing or reversing it.
Cryonics fits at the end of that chain. Even in an optimistic future where aging is conquered, people will still die of accidents and sudden illness before the cures arrive. Cryonics is the bridge for those who run out of time, a way to reach a future that may have answers we do not have yet. Seen this way, it is less an exotic gamble and more a logical extension of wanting to stay alive and healthy.