making theatre "mainstream"...

Hey all, Abbey here, and a newbie to the forum. There's been a question on my mind...based on limited brain-picking from general public, and finding the general belief is theatre is not a "mainstream" source of entertainment the way rock concerts, movies and partying on a weekend at a club/bar/pub are...so.... Why is it that theatre is not "mainstream" the way film is? I believe to a larger extent it has to do with accessibility and conveneince, but there must be other reasons. Things like: Is it because theatre going is generally seen as a "high-risk" venture? Because the stories are seen to be not as good? People do not want to confront the live actors and the potential breakdown of the fourth wall into personal space...? What is your opinion? And yet another question: any thoughts on how to make theatre more mainstream?