Not really. They were already going to have Batman in that time frame before it got delayed. They were gonna do Aquaman in fall 2018 and Batman in Holiday 2018. Now Aquaman is Holiday. They could release a smaller movie like Sirens or Batgirl in October 2018 and it wouldn't effect AquamanHell naw they filiming right now.
Nothing gonna fill that spot plus why would they release within a month of each other Thats just hurting both box offices