That's because moral justification isn't at the center of our society. The market is. Many attempts have been made to switch from the market to something else, not many were brilliant.
The "lucky historical accident" you cite isn't one... It's just the way our society was built.
Also you could argue on many different levels. To me, long studies meant delayed enjoyment of life, less freedom until 23, etc... You get less immediately, more later.
In the end, the question is really: "Do we want to use social engineering (as it's called) and try to build a brand new society, when all other attempts lead to poverty and war?"