I think it’s helpful to consider transsexuality as cosmetic surgery. It’s another case of “I’m unhappy with certain aspects of my body and I want to change them.” Currently, doctors in the US won’t perform this cosmetic surgery unless you convince them you’re an X trapped in a Y’s body.
The cosmetic surgery viewpoint goes beyond binary sex choices of male and female. Given better technology, in the future one could choose to be a blue-haired futanari catgirl. Why? Not to fit some story about finally becoming one’s true gender, but simply because it could be fun.
A couple of things:
The cost of cryonics is more than just the liquid nitrogen. You need to mobilize a team to properly preserve the brain, then keep it in a refrigeration unit indefinitely.
If you keep tissue at temperatures slightly below 0ºC, it’s not really frozen. Tiny pockets of concentrated ions will lower the freezing temperature of water in in those areas, keeping portions of the tissue liquid. I think the effect is similar to salting roads in the winter time. Anyway, the tissue degrades over time scales we care about.