I have a couple predictions...
Someone is going to be pissed off that their "childhood is being ruined" by having their vision of Piggy getting his head crushed by a rock replaced with a girl. We all remember the outrage that the Ghostbusters remake caused. I don't think think that this will cause the same outrage, since I don't think that 40 year old males that live with their mothers have action figure of Ralph, Jack or Piggy, but I can guarantee that someone will be "outraged." Even though nowadays, "outrage" consists of four people sending mean tweets.
I can also predict that some females will be irritated that two male writers will be writing how an island full of girls will act after being plane-wrecked.
Is this social justice run wild? Or just a new take on an old tale? Do you care if source material is changed for a modern audience?