The road to transhumunism will be gradual to the point that people will not notice.
Can you imagine the reaction of people from the 1930s if you tell them women slit open their breath/bums and stuff bits of soft glass/sand under their flesh to make them more attractive. Or that people do surgeries to their faces to look entirely different. Shining really really intense light to itch away the cornea will make ones eyesight better. Biomoniac limbs are already happening and so are brain electrodes to control them. Latest is highly flexible polymers that reconnect the nerves for people with broken backs.
I have bad knees and terrible eye sights so I can't wait until being better.