It's altogether possible they still have confidence in building a franchise, correct what was wrong in this one (For starters the incredible budget and apparently the alck of focus) and see any losses from this as "Leader Losses".
The 2 recent Animated movies, and the Animated series coming, could likely elevate Green Lantern's profile and make a well done sequel profitable (But, of course, with so much coming out, the timing of release of a sequel, would be just as important as the quallity of the sequel)
One Day I hope to be the Man my Cat thinks I am
Where are we going? And why are we in this Handbasket?