My guess is
dc is planning a new Constantine movie and don't really need too much adult stuff in the movies.
Comics are also now more like superhero tv shows wherein you get a reboot about every time there is a new tv show or new comic book series relaunch. Even before Flashpoint,
DC comics was already similar to superhero tv shows and the comics were already rebooting quite frequently, for example, the many reboots of the Doom Patrol after coie. We now have a new take on Green Arrow in the Arrow tv show and comics are similar in that once a new writer takes over Green Arrow, it could also look more like a reboot.
Constantine might be put to better use in the dcu titles and maybe movies and Vertigo will do just ok without Hellblazer.