There's been a lot of speculation as to why pulled out of Fifty Shades of Grey. Christian Grey would certainly be the role of a lifetime in terms of impact on a pre-existent fanbase, and there's no denying the obvious financial gains.
Hunnam cited his 'immersive TV schedule' as the official reason for his hasty withdrawal, which seems flimsy at best. The leading hypothesis at the moment is his reluctance to be the new . Fifty Shades has a lot in common with the Twilight franchise: it started out as Twilight fanfic, for starters! But mainly, the massive popularity of series, specifically its popularity within the target group of romantically-inclined female viewers, is said to have scared Hunnam off.
Sure, Robert Pattinson has continued making movies, but he'll always be Edward Cullen to millions of fans - and, more importantly, to casting agents. It seems that Hunnam just didn't want to go the Twilight route. Still, dude has both gritty, finely-crafted TV (Sons of Anarchy) AND big budget, crowd-pleasing movies (Pacific Rim) under his belt. He's going to be just fine. Take your lovely face, toned abs and great resume, Charlie Hunnam, and go forth and prosper.
Although public pressure is strong for either or to take the role, I really think Fifty Shades is a great chance to catapult an unknown into acting. I mean, they basically need a very sexy, very handsome, commanding sort of guy. A whole ton of guys into acting fit this description. Isn't it more exciting to await a totally new face for a legion of Fifty Shades fans to fantasise over?