In the U.S. the psychedelic revolution has already happened. It's over. What came of it? Millions and millions of people tripping did effect society. It had
to. How so? Well, people running around in the woods stoned began to appreciate nature, and see how urbanization was ugly. So the environmental movement started. Hungry tripsters got grossed out on eating hotdogs, so health foods came into fashion. People had their limited views smashed, so a lot of social rules became challenged, sexual behavior included. The ugliness of war was seen through the propaganda, and the anti-war movement was fueled. People found out that their minds could experience life in different ways, so eastern religions gained interest, and so on. (Plus some interesting rock'n'roll was played.)
And of course lives were ruined, and all that stuff. It's not as if psychedelics, and empathics, ever completely left society, but they're not going to do much more to improve it.
Soon there may be no Earth to take rebirth on.
True, and it would be a real shame to have to start out all over again as blue-green slime somewhere else.