Regarding the continuity, the obvious out is the multiverse angle. Given that Ezra Miller is still the Flash, it seems that DC/WB want to keep that door open.
In a perfect world, Birds of Prey, The Suicide Squad, Shazam would keep the current DCEU afloat while they are able to take their time with the soft reboot. Build up Batman, Superman, Green Lantern for the Flash multiverse crossover. Give Batfleck and Cavill's Superman a proper send off, and you end up with a new universe of Batman (Pattinson), new Superman, Wonder Woman (Gadot), Aquaman (Momoa), Shazam (Levi), etc.