The only reason it would, and this is a long shot, is because they have invested so much money in trying to build a franchise that they could somehow turn a profit with a sequel, but I doubt that.
One thing I always found interesting with TDK is that when you look at the merchandise for the film before it came it, it had a lot less stuff than batman begins, kinda makes you think that they just didnt expect it. I mean they cancelled the video game (yes movie games suck) but had they known it was going to make that money that probably would have never happened. They didn't have an official guide etc.
Green Lantern has such a large amount of stuff. I mean were toys of half the corps members really necessary when they were barely shown, on top of that do people actually care about buying that stuff. Will be tense weeks for DC but someone is going to be losing there job.