Thought experiment flawed assumptions. Can't reduce Adwords revenue by 50% overnight (unless by a bug). Think advertisers set budgets, they just get spent on di

Thought experiment flawed assumptions. Can't reduce Adwords revenue by 50% overnight (unless by a bug). Think advertisers set budgets, they just get spent on different searches. What could be reduced is the quality, and that could lead to gradually losing of revenue over time. So you have a trade-off between increase of quality here and decrease of quality there. So it really boils down to the ratio of these two quality changes.