This is how dumb and tunnel visioned he is. Did it not occur to him that whatever damage Justice League might do to WB, it's probably going to be mitigated by, oh, I dunno, the next wave of Harry Potter movies? The first Fantastic Beasts made over eight hundred million dollars worldwide. I'm sure the new one will do comparable business.
This may represent WB finally bailing out of DCU movies, at least until they can find an artistic vision for them that works, but "the end of Warner Brothers" is stupidity writ large. Fuck, man, Looney Tunes alone could probably plug whatever holes DC has put in the good ship Warner Bros.
Does anything that isn't capeshit even exist for this irritable toad?