They could - but both the audience and the budget for a show on such a niche streaming service will be a lot smaller. Notice how the animation for YJ is less polished than the first two seasons. And you know they probably spent a lot more on a known and proven fan favorite like Young Justice than an unknown like Shazam will get. Just saying, there's no good spot at the moment for a really good, decent budget Shazam right now. But if the streaming service turns out to be a success and earns a lot of money in the next few years? Maybe.