The solution to Tubes is to keep doing what we've been doing for the lat 15 years. Or open a Tube site.
Seriously the gaming industry has innovated to the changing world of the Internet, it's used the benefits of the Internet to make online games more interesting online.
The adult Internet is just another way to deliver the same porn that's been sold for years offline, except a low quality. I've never seen anything online that wasn't done offline. The only difference is online it could be done by Ma & Pa operations. Offline they didn't have much of a chance.
Can someone come up with something that can only be done online and paid for?
And if they do will they be able to afford it, if they can will they and more importantly will it be more profitable than loading a site with cheap content and paying half the money or more out to promote the site?