I can see the selling point of kid superhero, but I don't see Jon as a glasses for us to see adult Superhero from his PoV yet, so I can't say anything about that. Still I think you are right that he is the second child superhero and that is his selling point, but I think this is I think what nearly all of posters here would agree, but Jon as a character can't or musn't grow up, because that will be the death of his character. His main selling point is that he is the son of Superman, that is a kid like Dick when he was a Robin. The moment he grew up from that and BAM he lost his character and to me that's not because of he became a dozen teen hero, but his main selling is that he is a child Son of Superman.
The matter whether he is a good teen hero or not is up to debate, because he only has 12 issues to tell his story.