Re: The Solution is Simple
At that end of the scale there could be an opportunity for a new style ad network supplier that would differentiate themselves by more reasonable ad behaviour and I think it plausible that their conversion rates would outstrip the current ad network suppliers (who don't give a shit). Sites would tend toward the better behaving supplier to benefit from the better conversion rate and user acceptance.
Alternatively. Son-of-Web - paper/pen/stamp/radio/high-streets/... and ads controlled by ASA & planning regulations.