Ya and if, if it becomes an event film, that would be the second female hero character WB/DC has introduced and elevated to somewhat a pop culture status in 2 years. They could seriously build on the female demo - they could become the type of audience that likes these characters, buy merchandises, show up for these movies, and not necessarily even read any comics or watch any cartoons.
I've never seen girls wearing female superhero characters clothings on the street (a bunch of Spidey and some Superman, maybe one supergirl), but saw 2 wearing Harley Quinn T-shirt this year. We might see random little girls running around with WW shirt or headgear this year.
DC has also made dolls and programs for young girls, this demo could grow up with these female characters for years to come.
So IF WW is a hit, I hope they can push forward with the sequel, make some moves on Batgirl, and if they don't think Ayer's their guy, hire someone like Patty's quality and move GCS along, they've already got the Tomb Raider scribe writing for 6 months, if GCS doesn't make it for 2019 at the latest, that'd mean WB is sidelining Margot Robbie for 4 years, and I don't really see that happening