1/3 of the population from western Europe to India died of the plague. That has some impact on both economy as well as lifestyle.
Anything that kills or maims most of your workforce will have social effects. But they were not lasting. As soon as the socialogical effects due to loss of population wore off, India went back to its evil, inhuman caste system (which it still has today) and Europe went back to Christian dogma and living in its own filth.
And what you have to realise is, that, ultimately, lifestyle and society has little to positive impact on evolution. This isn't evolving towards the rubbish scifi spouts like "godhood" or "perfection". There is currently only one driving force in evolution still available to man, and that's sexual attractiveness. And that doesn't evolve towards superiority or perfection, ask any peacock.
There was only one civilisation that had its polices rooted in evolution, and that was the Third Reich. And we never want to go back there, regardless if we all do devolve into dumb, timid, inbred couch potatoes that can't survive without their technology. The price of perfection is too high.
