I'm not sure what a equivalent disaster would be in a world revolving around high school. Everyone forced to do remote classes, and in-person classes only resuming NOW? That'd...probably be hitting too close to home, really.
Too close to home, but somebody needs to do stories like that. As much as kids probably liked remote classes at first, imagine how utterly apocalyptic everything seemed to them. Imagine if even the 2008 crash was before your time. Imagine this was truly your first big thing, with no other events in your life to help you contextualize it. One day you're told to stay home from school and not go back until whenever. Your parents have been told to stay home from work and not go back until whenever. You're a kid and time still passes slowly for you, so this seems like it's going on forever. Now imagine spending the rest of your childhood watching shows that just act like nothing like that ever happened.
Kids are ready for post-apocalypse Equestria Girls.