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More random organic listings means that more businesses will be forced to bid for adwords driving revenue up. The effect is that adwords listings become more relevant than the organic listings. More clicks for google. Searchers will start giving adwords even more importance.
@ColourOfSpring, I do think we should consider theories that end with "...and then Google makes more money" because that is indeed what they're doing. Not all of these theories will be correct or complete - maybe not even any of them. But what's needed is further investigation (as tedster suggests has already happened in this case), not outright dismissal.
@Tedster, what form might the proof take? And what other possible explanations do you feel make the most sense?
I do think we should consider theories that end with "...and then Google makes more money"