It's a dumb idea. It's so dumb that I'm challenged to understand why people think it's a good idea...other than greedy companies that will profit from it. FP has said many times "zero chance." It pains me that he'd consider it without seeing a miracle of a script that almost makes the idea of a sequel tolerable. The bottom line is; the earth doesn't get attacked by aliens twice. To pursue that idea tarnishes the original. The only thing that gives me an ounce of fear that FP would do it is that he's done moves like Hancock, which I can't imagine were that good on paper when he agreed to do it.