Where mainstream can go paid placement and give certain things away for "free" (assuming they can find enough viewers who are willing to be entertained and targeted for advertising at the same time) it's going to be hard to translate that to porn IMO. Unless Coca Cola starts encouraging porn stars to drink cumshots out of Coke Cans at the end of scenes (with the trademark unabashedly facing the camera, of course.)
All of my friends get their porn for free from torrent sites. They don't understand my business, they assume I'm redundant. Some of them believe the business is inherently evil, rife with scammers and spammers (obviously that exists, but its disheartening when your friends lump you in with those shitheads because they've had a bad experience looking for naked pics of Paris Hilton online.) They will never pay for music or porn. I hope the music industry will go the free music approach, because I feel the music cartels are just a bunch of greedy cocksuckers and the artists and consumers will eventually gain more by a free-music model. But porn is different. Until we can fill arenas with people for live Pornstar Fuckfests and sell them t-shirts, there will be a market for porn. People buy adult memberships for convenience. The torrent people will never pay. But they will not have the convenience of a members' area and all that goes with it.
That is, until our model is destroyed and replaced with a new one.