In the same way that Google's spelled out what constitutes PR and results ranking, and provides examples of over-optimization? < /devil's advocate :-P >
I'd think Google is much more likely to continue their established pattern of vagueness with the AdSense TOS than they are to suddenly amend it with specifics. Google has stated over and over that they act differently than most organizations. In areas where complete automation is not possible, they prefer to take each situation on a case-by-case basis. Vagueness serves this approach well. Google may eventually come out with an AdSense "guidelines" document similar in nature to their Webmaster Guidelines, but that's probably some time further down the road.
I believe that the base "problem" can be attributed to Google's corporate communication style, which is poorly understood outside the company itself. Individuals communicate clearly. I've been repeatedly amazed at the communication skills of various Google contacts. However, with most group or corporate communications attempting to elucidate corporate policy, these stellar communication skills are not evident. Google's collective pronouncements are often mysterious, vague, or even, at times, naive. Approved, and well understood inside the Google community, where discussion has flourished, the degree of internal consideration is not evident in the majority of policy statements. Further questions are often met with slower responses, or even silence. Preemptive communication -- i.e. communication to head off a potential problem -- is extremely rare. Evidence the double notifications in the Payment History tab in June. Many organizations would choose to make a global announcement. Google chose to handle the situation case-by-case with individual publishers. Further examples are easily found in the GMail beta launch.
This communication style may, or may not, prove popular with shareholders and/or the SEC. In any case, I think it'll take much more than the wishes of a few AdSense publishers to change the tide. Smart observers will create laboratory sites of their own, or bookmark a representative number of sites they believe to be "riding the edge" of the AdSense TOS, and observe them carefully over several months to see which sites survive and which lose AdSense ads. If AdSense and ranking appear unaffected, then it's probably time to adjust and/or redefine that personal guesstimate of "the edge". There's always going to be a very subjective choice of placement for each publisher, relative to that edge.
I wonder if anybody has come up with a GameBoy version. Oh wait, maybe that's us! ;-)