Tube sites are killing porn - but so are porn sites.
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Pick a random membership porn site, any site and what you see is shit like 732 full length videos, 19520 images, 10 sites for the price of 1, ect.
Has anyone in the porn biz ever wondered why HBO has like maybe 10 movies a month, then they rotate them off the next month and add different movies?
Just in case nobody has ever thought of it, I'll tell you. It's so you have to keep subscribing to HBO to see movies. If you could subscribe to HBO and download every movie ever made in less than a month and then cancel, you would - and this is exactly what porn consumers are doing. They download 70000 hours of porn and stop paying for the next 6 months.
If porn studios are going to survive, they will need to adopt the Hollywood model and provide different content every month - NOT THE ENTIRE LIBRARY!