Or to spin this another way: Americans spend around $200B* annually on education (private spend, on top of federal/state/local education spend), so this would provide all-expenses-paid free tuition for everyone for 18 years, or more than 50 years if focusing on primary/secondary education. In that time, there might be a new crop of megarich to continue the cycle :)

([*] $50B for primary/secondary ed, $150B for higher - figures via Kagi Assistant, which I didn't double-check).