For the record (before I get flamed for the comment I am about to make
), I LOVED it - I rank Deadpool in my top 3 super-hero films of all time!
However, I think the R-rating is the wrong message to take away from it's success, and I fear that IS what Hollywood is going to think is the lesson here.
Deadpool succeeded because it was an awesome, creative, innovative film - not strictly speaking because it was rated R. However, Hollywood likes to reduce things to formulas, and try to duplicate them. You can't really duplicate creativity and innovation, though. What I fear is that we're going to get a wave of copycat films now... "hey, let's slap more violence and vulgarity into X-men, Wolverine, Cable, etc"... which will copy the surface factors of Deadpool, and yet suck.