Being suspended in a liquid and zero-g are not at all the same thing. Gravity still pulls, e.g., you will still feel what is up and down.

Experiments with rats indicate that zero-g is not a good environment to have babies, but also that it is possible. In any case we could just create artificial gravity.

My best hope for humanity is transhuman: to adapt ourselves to our environment. Think the ousters in Hyperion.