Wikileaks showed us the way. The only thing left to talk about is public access to data, especially data on people in privileged positions.
Nothing can really be done to control black and gray market data. And, little or no actual control can be exerted on the "legal" companies and practices as well. Even if you manage to hide your own data through various means, it complicates and restricts life, and does nothing about the data of the rest of the population, which affects and includes your data.
The only real secrets are those of people who can afford the expenses of keeping secrets - corporations, governments, and their associated criminals.
No, the path is now to acquire public access to data on these people.