Are they even going to keep Snyder on a shorter leash for Justice League? I ask that because that presumes basic competence on WB/DCE's part, when this is the company that gave creative oversight of the entire DCCU, with an incredibly aggressive release schedule to boot, to a filmmaker who had already proven that his vision for these characters was incredibly divisive.
I'm not sure they have any idea what they're doing, frankly:
The big question isn't whether they will keep him on a shorter leash. The big question is whether there is anyone at Warner really holding a leash. Stuff like budget and runtime are standard arguments between filmmakers and studios, but if we're talking about WB having a creative stake in the DC slate and trying to restrain Snyder... who's the one for the job?