I was always kind of baffled by the way DC handled their material after the huge success of their animated shows. So many people grew up watching Batman, Batman Beyond, Justice League, Static Shock, Teen Titans, etc. This was mainstream superheroes way before Marvel took over. Millions of people were introduced to these characters and these universes through these shows and were loyal fans of these interpretations of the characters. These weren't comic book customers. This was the collective common media market.
When it came time to jump start the DC Cinematic Universe, they didn't use any of it at all. I worked at a movie theater when Green Lantern came out. When the first poster was printed we put it up in the lobby where it was visible from the cashier counter. Almost every single day, sometimes multiple times a day, somebody would ask "Why is Green Lantern white?" They probably don't remember the name John Stewart (I didn't at the time), but they recognized Green Lantern as a certain character that was not the one Warner Bros used.
I wonder what the actual recognizability data on these characters shows. I have a very hard time imagining there are more popular or more widely recognized depictions of Raven and Starfire than the Teen Titans, for example. Maybe I overstate the significance of the DCAU because that is the version of the DCU I like best. But I feel like that is where the vast majority of mainstream audiences grew familiar with the characters and they could have made much, much more successful movies playing to that expectation. I'm not even saying they should have adapted this universe. But they never used any of it. Ever.
Imagine the state of the DCU right now if they made a Teen Titans movie in 2011 and established all of those characters at the time.
Bah, what do I know.