I think it could be interesting to see if Google could arrange an "ad blocker subscription" pass for websites. The site would block people with ad blockers unless they were a subscriber.

Google would charge 10-15 bucks or whatever the average web user is worth in gooogle adsense.

I guess the hard part is actually effectively detecting ad blocking. I assume you could write an adblocker that downloads and then just never actually displays ads. Without total control over your browser, I'm not sure how ad blocking detection would ever be accurate.