Aside from WB’s GL hangups, animating those would be a huge endeavor. Those are goddamn events in the truest sense of the word. Obviously a lot would need to cut to fit into the time limit, SCW won’t have Anti-Montor or SBP I can tell you that right now, but Blackest Night I think is something that could only happen in a shared universe. You need the history and the continuity to make it work. We need to see the heroes die and have them stay dead for a while before BN happens for it to matter.