That is a quite a pessimistic way to view the education side of this. Nobody was prepared to go fully remote, and having to pivot entire curriculums to online only classes on a moments notice was bound to be rough transition. But given a summer to address some of the more glaring issues, schools and teachers should be better able to prepare for remote teaching in the fall.
Also, people who are interested in learning and those who are driven will find ways to teach themselves outside of the traditional education system. To think that this pandemic situation will have some massive brain drain on society is a bit far flung. Luckly, we just so happen all have access to the largest repository of human knowledge ever assembled!