Green Lantern's Saturday number is $17.1 million (compared to X-Men's 19.7m with a lower opening day and established  fanbase).  Father's Day  softened the Sunday drop and will get it over 50m for the weekend, but there's no way it comes close to finishing north of X-Men in the long run.  It's going to tank next week.  Sub-20m is very possible. It'll be lucky to finish around 120-130m. Not a good return for a 300m investment. Don't expect a sequel, kids.