The DC extended universe is just starting and it has been announced that a Booster Gold/Blue Beetle movie is in development. Which is no surprise as DC has put many of their characters into film development but I feel Booster Gold is the perfect character to be introduced into this DC universe.
Booster Gold is a man from the 25th century. He was a gifted athlete, attending Gotham University on a football scholarship. He was exposed, disgraced and expelled for deliberately losing games for gambling purposes. Later he was able to secure a job as a night watchman at the Metropolis Space Museum, where he studied displays about superheroes and villains from the past, particularly the 20th century. With the help of a security robot named Skeets, he stole devices from the museum displays and used a time machine to travel to the 20th century, intent on becoming a superhero and forming a corporation based around himself to make a comfortable living. He is a shameless self-promoter whose obsession with fame and wealth annoys other heroes.
Booster Gold is a great character to use for the DCEU because he is very different to any character we have seen and uniqueness is something to cash in on. The DCEU is going for a very dark tone with their universe but it makes sense that booster gold isn't that dark 400 years of superheroes would make everything lighter and nicer. So his tone would work as good a reflection to the other characters. I don't believe that this character would be an original member of the justice league but they could have some fun with him, which is what I believe he was created for: fun.