If you want to reach the ground floor in a tall building, it makes a lot of difference if reaching it by elevator, or jumping from the window. Speed matters! A _very_ slow transition probably could be managed without disruptive impacts on the individual level. But we slam the brakes in ~2 generations, such a way a large share of people alive today will be still be alive to become destitute and unsupported by lack of replacements, both on macroeconomic level, and in the micro level. If a single kid today go childless itself, he/she is very likely to become a lone senior with no close family, eventually.