Yeah... maybe a twist at the end where Black Adam awake could be a neat cliff hanger to prepare a sequel! :3
maybe after Dr Sivana fail to defeat Cap Marvel and lost his great powers ( again; I'm sure they will bring up the 7 Deadly Sins in someways)
he then awake Black Adam to set up the next movie.... with maybe the battle between Black Adam and Cap Marvel going so wild that some members of the Justice League may come in to cut their fight....
I mean Cap Marvel and Black Adam are some of the "Heaviest Hitters" in the DC universe.... only someone like Superman ( or close to him in Power level) can attempt to stop their fight if both refuse to concede freely....
kind of hope they will keep that small bit from "Trinity War" were Cap Marvel/ Shazam punch out Superman, knocking him out a bit and being like " Holy cows! Did... Did I just punched Superman?! 0.0 I did! I punched out Superman! 0w0 "
I thought that was very funny! ^^
so much so I wanted to hommage that bit if we do the Furry Justice League idea where Tito Shazam would be able to Punch Redsaber Batman being shocked then super amazed soon after.... ^^