Really? That seems highly illogical and very irresponsible. Reminds me of that old proverb 'counting chickens before they hatch'. Maybe that's why STiD suffered in the eyes of many fans? In any case, they should wait for at least the ideas to be brought forward before green-lighting anything.
There's a difference between script development, which is often started very early on for potential franchise sequels, and actually greenlighting a project to start production. If a film's box office isn't good enough they can always pull the plug on the sequel. Simply starting script development doesn't actually commit them to make a film.
Edited to add: the weekend actual went up a little to $2,100,458 for $220,561,325.