I really hope they don't make a Captain Marvel movie (I will never call the pre-New 52 version "shazam"). Pre-Reboot Captain Marvel is my favorite DC superhero, but DC has basically reversed his personality completely in the new comics. That means any movie would him would probably have him as the horrible, greedy, mean spirited teenager from the newer comics, instead of the hero who was more of a boy scout than Superman that was around from his creation until 2011 (not counting the stupid "evil" turn in Countdown, which was complete BS and he had no control over anyway).
He was actually interesting as a orphan with a heart of gold who could become a hero by saying a magic word. The 90s Power of Shazam series did a great job with keeping to that idea at its core while developing Billy and his supporting cast into better developed characters. Generic angry teenager "Shazam" is bad enough in the comics, but I know any movie would use that version, because having nice, actually heroic heroes is something DC loathes in movies and comics nowadays. I'm betting her never gets a movie anyway, they'll be too busy screwing up characters non comic fans have a higher chance of recognizing. Then again, angsty, mean spirited teenager seems like something DC would love to do in a movie, so I can see it happening. I'll just hope any rumors of a Shazam movie turn out to be nothing more than rumors, just like the last time rumors like this were being talked about.
A Shazam movie could be awesome. I don't have a problem with Billy being a bratty teenager. Billy is an orphan trapped in the child care system and moving from foster home to foster home. That would make anyone jaded. He's still nice to his friends Freddie and his sister Mary. Besides the Wizard chose him despite his flaws. There is obviously good in Billy, and when he gets the powers he uses them to help people.
Also Carol Danvers is Captain Marvel now. Marvel comics owns the Trademark for the name. Go Carol Go!