I am S.O.B.B.I.N.G.
But can we just talk about how All Might chose Izuku for OFA because he moved without thinking when Katsuki was in danger because of the sludge villain? Like, I think that's one of the best callbacks I've ever seen before. Katsuki finally had his moment where he was completely, fully, and undoubtedly a true hero. All Might also went on to say that the true meaning of being a hero was self sacrifice. If that wasn't the most self sacrificial thing ever, I don't know what is.
But seriously, if he dies I'm out, like, drop the manga and anime both out. I can't imagine BNHA without our angry little Lord Explosion Murder.