The education needed for a functioning society should be delivered by the end of high school. A few generations ago it was delivered by the end of 8th grade.
And yes, college sports on the whole does pay for itself. Those stadiums are built by donated money, and revenue from ticket sales. Yes taken in isolation there are a lot of sports that don't make money, but they are subsidized by those that do (chiefly football and basketball). Sports stadiums are not the reason tuition has inflated by 700%. They are two separate pools of money. If you got rid of sports entirely it would not affect the finances of the academic side of the university at all.
It’s a question of what kind of “functioning society” you want to have. Those 8th grade education jobs still exist, but they’re in China, Bangladesh and other developing economies. And no offense to those people either. A lot of manufacturing depends on them.
Those are certainly “functioning societies” but their economies are much less advanced than in the US. It’s not realistic to say that an advanced economy can get by with education ending at age 18.
And yes, college sports on the whole does pay for itself. Those stadiums are built by donated money, and revenue from ticket sales. Yes taken in isolation there are a lot of sports that don't make money, but they are subsidized by those that do (chiefly football and basketball). Sports stadiums are not the reason tuition has inflated by 700%. They are two separate pools of money. If you got rid of sports entirely it would not affect the finances of the academic side of the university at all.