People have had this idea before. It's called "eugenics".
It has a bad reputation from its implementation by the Nazis, who might have corrupted it a bit for their other political goals.
But I think even a pure implementation of eugenics is not as good as the other options we have for improving the lives of future humans.
Very little of eugenics's bad reputation dates from the Nazis. Some of it dates from before and some from long after. In particular, the winners continued their pre-war programs for decades after the war. Eugenics became unfashionable around 1960, a bit late to blame on the Nazis. And I think the emphasis on Nazi associations is even later (maybe 1970 or 1980), after eugenics was clearly losing.
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