I'm not advocating for anything specific here. :) And frankly, I take your point and actually agree wholeheartedly. The status quo of data mining and tracking is terrible, and leads to exactly what you're talking about: people changing their behaviour (not just online) because they feel like they're being watched[1].
I realise I'm not providing a solution. I wouldn't even feel confident at pointing a general direction. I'm merely pointing out that I don't believe the right way to solve this problem of personal data aggregation is consolidating all this personal meta-data into a single spot.