After the disastrous depiction of Deadpool in X-men Origins: Wolverine (2009), Fox Studios wanted nothing to do with the Deadpool character. As quoted by Entertainment Weekly, according to Director Tim Miller, Tom Rothman, the then chairman of Fox read the script for the film and answered,
““No. We don’t get it.” Tom told me, “Love your passion but I just don’t care for the script. Don’t get it.””
And due its specific demands with the budget and an R-rating, the film got pushed even further back and it seemed like the Deadpool film was never going to become a reality. That is until the test footage of the film got ‘leaked out’ on the internet and thousands of Deadpool fans rejoiced to see their favourite ‘Merc with a Mouth’ being as true to the comics as ever.
Due to overwhelmingly positive reaction from the fans, the film was green-lit and the creators were allowed to make it Rated-R. And the rest, as they say, is history.
from The Express Tribune Blog http://blogs.tribune.com.pk/story/32572/when-filmmakers-take-risks-deadpool-is-created/