>>96653702He's very popular with females. Not sure this will have any kind of real impact for Justice League as far as box office, except that it might be a little bit easier for guys to get girls to go with them (although that really isn't a thing in this day and age given the general popularity of cape movies).
It should add a good bounce to the solo movie, which should probably do better than Thor 1 and Thor 2 out the bat, which is impressive considering it's Aquaman.