Now that the Aquaman movie is out and doing extremely well (could be the first DCEU movie to make over a billion), it's fair to assume that he is going to play a bigger role in the larger DC universe. However could this be at the expense of Wonder Woman?
For the most part, wonder woman has 2 major things going for her (she is a symbol of female empowerment and DC's greatest warrior). Wonder Woman is considered to be a character that combines near Superman level power with Batman level skill and thus the greatest warrior. In the New 52 however, Aquaman's power levels went up in comparison to other characters (he was almost Diana's equal). It goes without saying that this kind of dilutes Wonder woman's status.
Note: I like Aquaman nearly as much as I like Wonder Woman. I like both Characters because they have a good balance of skill and power. It's just that Aquaman has a lot more going for him outside his combat capabilities while Wonder woman is reliant on being the ultimate Warrior.