To be honest, people are already doing things about this..
Check out
Follow your favorite pornstars | STIFFIA. Most of you here probably already know it but may have forgotten about it. Manicamoney runs it. On stiffia , you'll find content from a nice variety of paysites, and each one is considered a channel. Users can signup to every paysite on stiffia which means the problem with variety is fixed.
It truly is a great concept, and even for a webmaster as myself, who knows the industry quite a bit, it was damn tempting to join, especially considering they take paypal, which frankly, is awesome :D
Anyway, this is an example of how one company, brings together lots of paysites so users can find everything in one place. Let me know what you think, I really like the idea.