Answer:
Well Superman has made many differences; people look up to him. People also want to be like him. Even if he isn't real, he still makes a difference. Batman doesn't like Superman. If Superman wasn't made into a cartoon, or live action movie then maybe Batman might not be there.
The difference Superman had made is in DC, when Lex Luthor had attacked. He had saved the day. In a Lego movie Lex Luthor had broken free. Batman and Superman both had saved the day. It was mostly because of Batman but, if Superman wasn't there then it might have gone down differently.
The model of hero has changed a lot. From the first superhero "The Phantom" in 1996, To the newest superhero Amulet. If you look at the detailing this is what has changed most in time.