You do not know WB's overall plan for Green Lantern. WB attempted to have big, mainstream projects based primarily on what Johns did with Green Lantern, and they all flopped hard with the general audience. Perhaps they are getting away from that so they can do something different, which the general audience may respond to better. These days, there's often a lot more at stake than just some comic fans.
Johns wrote and directed about 9 years' worth of Green Lantern stories. Writers can't just suddenly ignore that if they want to tell a decent, continuing narrative. A writer like Venditti especially wouldn't. They've likely been putting things in play to get rid of what they don't want (entities, Blue Lanterns, Hal Jordan and Carol Ferris being together). That doesn't mean they're going to entirely disregard everything Johns did. Also, we'll see what they have in store for the Parallax entity. It's probably something special. *crosses fingers for Hal Jordan Parallax*
Oh, heck yes!