I think the concept of the Legion would make a great premise for a Sci-Fi T.V. show. A large cast, exotic locations, and a library of compelling stories to draw inspiration from would almost be it's own seperate universe/timeline so that it would not interfere with the movieverse and Flash/Arrow/SuperGirlverse.
I like the idea of the Legion having multiple functions explorers,peacekeepers, and ambassadors on the behalf of the U.P. Exploring new worlds and expanding the U.P. introducing viewers to a larger part of the DCU.