"I don't want to see Superman replaced with Superboy"

In this quote, Gavin DeGraw is revealing his opinion on the iconic superhero, Superman. He specifies that he does not want to see Superman being replaced by a more youthful version, Superboy. This could be interpreted as a commentary on the constant need for newer and more youthful variations of popular characters in the entertainment industry. DeGraw might be recommending that the initial and ageless version of Superman should not be replaced or overshadowed by a more recent, less knowledgeable version. He might likewise be suggesting that the initial Superman holds a special place in his heart and he does not want to see it diminished by a newer version.