Oddly enough I just saw an ad on TV. There will be another installment in the 50 Shades saga......
Yeah, the book series was a trilogy. It only makes sense that the film series would be, too.
Then again, this is the era of the franchise: find a concept that can be made into multiple films, and milk it for all it's worth. It doesn't speak at all to the quality of the films being made (the American audience is perfectly willing to buy crap, I mean, look at the Presidential candidates in 2016) but then again, the Academy's idea of good cinema isn't much more in touch, either.