There is: a browser switch/standard: "ask ad-providers to personalize ads" / "use generic ads". Getting anyone to honour that is going to be a big problem though. So we have to implement that on the client side, by privacy protecting measures. (Not sure how at the moment.)
There is also something that keeps being lost in this: identity and tracking are different things. Opt-out is a preference setting of an identity, and networks store this preference just like they store history and interests. By disabling 3rd party cookies and scripts, it disables the saving of any opt-out status as well, which btw, is actually mandated by certain laws and regulations so it's not all wild west here.
