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no such "elitist" and "non-egalitarian" idea would ever be embraced in the US.
On the other hand, the USA may actually be the first place such educational reform may occur, allowing curriculum and pacing choices which may supplant skipping.

The fact that homeschooling is legal in most states, that forums exist to exchange ideas and build support, and that private schools, specialty public schools, and charters exist... all lend hope that we can help inform society that we as individuals are and remain equal despite our considerable differences including age, stature, intellectual profile.

Life, liberty, and the pursuit of happiness is potentially different for each individual. Each person or family may sacrifice, strive, and weigh opportunity costs in choosing to set personal priorities and gravitate toward a unique mix of intellectual, athletic, spiritual, political endeavors.