
Why I think kid Jonathan will always be THE main Jonathan
Jonathan Kent is a fairly new character. He was introduced in 2016, I think.
Anyway, from comic runs, the adult (bum) version of Jonathan Kent has existed far longer than the child version. However, I believe kid Jonathan will be the main Jonathan. Either he'll be back through retcons, new stories or a reset.
This is due to one fact that child Jonathan has over the bum version. He's far more marketable. Not just that but he's far easier to write.
Supersons has been a huge success in comics. So much so that it got its own animated movie. Absolutely nothing that followed after that holds a candle for Jonathan. Not new titans and especially not Superman: Son of Kal-el.
If we were to try to adapt anything out of the comics into a show or movie, I don't see a way to use adult Jon. He's too confusing. To explain that he was a kid but got stuck in a volcano and whatever in comparison to just going "he's the young son of superman" is inefficient.
So any money that Jon makes for DC will be as his child persona. Not only does he hold the superman legacy, easy writing and actual personality, he is much better to adapt and write. This is how companies will always think, with a money first perspective.
I think that we'll have to give it some time until a writer brings back Earth-0 Jonathan in the current story or we get a reboot/reset.
Not only that, but the majority of course also want him back.