While this is already happening today, it might be foolish of Google to put such tools in the hands of its publishers.
However, one thing that could happen is a way for users to fix their issues with low AdSense generated income on their site. This could be done through an on-line wizard or something similar that would make suggestions to website owners based on their contents.
But the major buzzword of the day is RSS. The possibility of sending targeted ads directly to users without requiring any navigation on their behalf is becoming a reality with RSS. And there are clear signs that Google isn’t going to let such an opportunity pass by.
This is what “interactive television” and similar items have been trying to do for quite some time now. But the Internet would be a much better medium for this, because there are no mediums quite as interactive as the Internet.