Sources say the studio explored several other options before settling on the pair, who were announced Sept. 2 via tweets from Fifty Shades author EL James. Ryan Gosling was the original prototype for the 27-year-old billionaire with a penchant for S&M, but he was not interested.
I read somewhere that he doesn't do sequels and knowing that it is a franchise he didn't want to do it.
Smart move in this case though... Apparently no one was actually allowed to read the script and if you're going by the source material there isn't much there