That sentiment was the most imminent back in June 2017 and going by this year it's even more worse.
If it wasn't for Wonder Woman's run jumping into the initially supposed landmine of summer 2017 , the season would've been one of the worst.
It's not tested enough but superhero movie for ladies have a rather resilient post OW run if we go by WW and CM.
I'm saying that this movie can have enough fan pull for a bigger opening at the start of June and let the legs run through all the way to Independence Day and Labor wknd akin to the first.