Be careful what you wish for. Ultimately you can't stop publishers from using third-party tracking code in a first-party context. This is just the easiest (laziest) way for publishers to do so.

It's not like publishers will give up on integrating third-party tracking code into their tech stacks once this technique is dead. They'll have to do so at a deeper level, e.g. reverse proxies, NPM modules, etc.

Next battle in this war: adtech code becomes indistinguishable; tracking IDs start appearing in all exit links from major publishers; adtech firms & publishers coordinate on the backend to sync those IDs. What then, get rid of URLs?