I think it is more important that the Aquaman movie have legs rather than be the #1 movie the first weekend of release. Wonder Woman had the lowest weekend opening of the DCEU movies
prior to Justice League. Yet Wonder Woman went on to make the most money domestic of all the DCEU movies. If Aquaman gets good reviews and good word of mouth it should do fine even
with Mary Poppins, Bumblebee and what have you also in theaters. It doesn't have to be a $billion movie to be successful.