Gus Van Sant, who was initially going to direct
Brokeback Mountain, said in an interview:
“I was working on it, and I felt like we needed a really strong cast, like a famous cast. That wasn’t working out,” Van Sant told IndieWire. “I asked the usual suspects: Leonardo DiCaprio, Brad Pitt, Matt Damon, Ryan Phillippe. They all said no.” Brokeback Mountain producer Diana Ossana confirmed Van Sant’s story to IndieWire, saying that all the actors had turned down the project “for various reasons.” Maybe they just
really don’t like camping.
http://www.vulture.com/2018/07/here-are-the-a-listers-who-turned-down-brokeback-mountain.htmlGood thing they said no! Would we still be here 12 f'in years later if the movie had starred Brad Pitt and Matt Damon? Maybe, but at this point it's hard to imagine anyone but Heath and Jake in those roles.