I've never understood this obsession DC has with rebooting its universe(s) through hyper-complex stories of multiple universes and different versions of characters colliding with each other. This completely defeats the purpose of simplifying things for new readers, especially when the fallout from such events continues to be treated as a side note in the new series. Total nonsense and the reason I always select one-shot or relatively self-contained stories as my DC comics readings (mostly Batman, whose rich universe, fortunately for me, allows it to stand alone anyway).
If Gunn & Safran decided today to build their universe through events of this nature in a movie like The Flash or something else, it would already be a misstep imo. Apart from a hard reboot, I'm convinced they won't have a chance to succeed.