With your penchant for writing realistic fiction, I had wanted this to be one of those as well. I'm sorry to hear about what happened, and I'm glad that you made it out alive. I don't know if the world would be the same if it had been you who was the unfortunate student. Such a profound experience that has undoubtedly influenced your life moving forward.
I do agree that we public schools feel like an antiquated notion. People can learn anywhere, more so now than before. If the abolishment of the school system is inevitable, then it should be starting now.
I always use the 'fiction' tag for fiction, but even then I try to keep it real! I think back when I was 14 I had a sense of 'I'm an immortal being, but school takes forever'. I was never frightened during the incident. I will say that after that first shot missed me, I jumped down behind a retaining wall safely before he fired the next round! I learned that from TV. If my parents had known that the TV may have saved my life that day, they would have let me watch it more often I think. We should all be glad that my parents didn't let me watch much television programming though.
When I play out the idea of schoolhouses becoming obsolete, I imagine the concern of the teachers who devote their time and lives to that school, or it's students, but I would imagine that the best teachers would find that communities will pool together resources and create space for local and home learning groups. It might even be more rewarding for those teachers, who often seem to be underpaid for their efforts in educating the children of strangers. Better for everyone, is what I always try for when envisioning the future.