I think a lot of consumers of porn are interested in short clips (5-10 min) of consistently high quality. This is a niche that isn't well served yet. YouPorn and the like is a grab-bag of short clips -- You can rummage around and find good content, but isn't a place where you can just go, press a button, and know you'll get something with good content, tailored to your tastes, with high quality sound and video, instantly the first time. An application that presented tailored "channels" as a TiVo-like application would stand to make a lot of money.
Studios and other porn content producers would like this if it could guarantee them a payment for their content, provide data on the viewing habits of users, and add user interfaces so that a consumer could click a button to buy a DVD or other product.