Well the Joker movie is being release about 3 weeks before WW84 was set to release, so that may be part of it as well. It makes me kinda sad that they pushed it back, but maybe it will allow them to get everything done on it and it will be absolutely beautiful like the first one was.
It's being back tracked to 2020 as well and I'm not a real fan of Ezra Miller as Flash
What do you mean being back tracked to 2020? Flash or Aquaman? I agree with you though, not a big fan of Miller's Flash.