Third party cookies are already on the way out, allthough it is going very slowly. But if that is already happening, I see no reason to replace it with something that is going to stay and is only slightly better. Being patient is easier and better, it will be a question of a few years I suppose, instead of, I don't know, forever? :)
Content providers want third party cookies. Users have no idea what third party cookies are. Any deprecation of third party cookies will have to come from the user-agent (Safari and Chrome being the only ones that matter).
Yes even the advertisers don't care. It's the networks themselves that build value worth big data that keep the myth alive that tracking is necessary for advertising.
