I think that mixing the smart kids in with everyone else is just misguided in the first place -
Hey, wait a minute. My freshman year at Catholic high school I made enough money doing football players' Latin homework that I was able to start a nice record collection. It taught me entrepreneurship, the value of a dollar and the fact that football players were decent enough guys, one of whom could get the best weed.
You're talking about taking away some of the most valuable learning experiences of my youth. The summer before my freshman year, my parents sent me to this weird school for high-achieving kids in Evanston and I hated it. All this adult attention and zero fucking around.
I learned a ton from my classmates during the years of parochial and public education, both the ones above and below me on the achievement scale. I also made some lifelong friends who are more important to me than whether or not there are sufficient software engineers to fuel Silicon Valley's dreams of our future.
Anyway, it's not the high-achieving kids that need to be sequestered and given extra attention. They're going to do fine (except for the ones who end up shooting up a shopping mall). The ones that need help are the ones at the other end of the scale. The ones that have been hosed by history and will grow up in a world without jobs.