Well, it's not like it any chance at being a blockbuster anyway. It's slow-moving, with very little action and very litte dialogue. I'm sure it will be a really good movie (McCarthy book, Hillcoat directing, cast), but it's never going to be mainstream.
The only possibility is if the "Oprah Book Club" fanbase goes out to see it. And if they're interested, I doubt many of them are going to download shitty cams of it rather than seeing it in the theatre.