IMHO affiliate tracking as we currently know it is going (and needs) to change.
Rather than the cookie or session id methods that so many processors and programs use currently, I really believe that we're going to see a transition to 'actual' affiliate url linking, meaning that each affiliate will be given a URL to send traffic to, not get given an affiliate ID and a linking code.
Something akin to this...
http://youraffiliate.domain.com
It really is the easiest and most secure way or tracking where a sale comes from, can't easily be manipulated (unlike cookies and sessions) and will make sales long term from the search engines once such urls are listed in the SERPs.
Another option that has been used in non-adult randomly throughout the years, is embedding a code into a meta tag (kind of) that is back-tracked via the affiliate program to credit the sale to an individual affiliate.
For the most part, adult has become stagnant with how we approach a lot of the business models we take for granted, there hasn't really been *ANY* advances in the adult industry for a good 10 years plus, we (the industry) used to drive the technology of the internet, now all we can do is rip-off business models used by mainstream companies to the extent where we are slowly but surely killing the porn business because we've become complacent over the years and abused the technologies that were good for business to the extent that surfers hate them... DRM for example.