I think it’s more of an extension of the teenager fetish. School uniforms are something only school-aged children and teens wear regularly, so it’s become a trait associated with them.

There’s also some scenarios that are less problematic (at least imo). Some people have a general uniform fetish (cops, nurses, etc). And sometimes couples that want to roleplay themselves as students.

That being said, yeah there’s definitely some creepy fucks that can’t stop staring at teenagers. But I don’t think getting rid of student uniforms would put a noticable dent in it. That ship has already sailed. Keep in mind that french-style maid dresses aren’t really a thing anymire, and people still fetishize that. I doubt the school uniform fetish will go away even if every school in the world did away with them