I agree that it should have ended with Izuku being a teacher, and quiting being a hero, I would've liked the ending WAY more, and telling other kids that they can be heros too. It's just beautiful. Although, with Izuku being a teacher he would drift away from being the main character of the story and would focus and other characters more than Izuku. Because he wouldn't be a hero anymore, he would just be teaching kids how to be good heros and how to control their quirks as best as they can for future reference. I don't know who would be the main character of the story if that happens, all I know is that it would be an amazing story line. Being a teacher would save him so much trouble, and he wouldn't necessarily be part of a war. He would be quirkless, but that's okay, he would be a great teacher to future heros on the line. Though both ending were good, I'd prefer this one way more than the original ending that was written.