I'm sure we will. And, like with mutations, the default assumption for a random change isn't very good. In this case, the historical record points to worse-than-random outcomes.
Democratic socialist countries have some of the best QoL in the world.
This narrative is largely untrue. Scandinavia started to prosper only after they liberalized. Of course, there is a big difference between intelligent redistributionism which respects and leverages market forces, and the kind of socialists who implement rent control and government-run grocery stores.
Yes, New York is certainly falling apart. And the mayor is notoriously unpopular!
AFAIK democratic socialism was only relevant for a short while in some places in Africa 100+ years ago, there are no current countries with democratic socialism.