It feels like, at this point, the actor who played Billy in Shazam is going to be old enough to just play the adult hero part of his identity by the next time we get to see him, if he ever appears again (since his movie wasn't that profitable, unfortunately).
I know you mentioned you gave Shazam a B... so you liked it enough that you think they should have moved forward?
But I think you may be right...the way the DC Film Universe works, it will be forever, if ever, if we get a sequel to DC's "fun" end of the spectrum