I too doubt that we will see explicit mechanism for users to manager/report ads on a website, but I do predict that we will keep seeing ads on website even if adblocking reach 100%. For example, online stores normally has a "if you like this product, then you might also like this other thing", a advertisement that I doubt will be blocked any time soon. Similarly, streaming services like to recommend films and music, and that feature is something I hear some people really want to have and would be upset if it went away. Youtube dedicate a lot of page space for this, including the front page, the top of the side panel, the top of the search result, and the end of every video.

The upside of those kind of ads is that they are intended to be both a useful tool for the user and a revenue source, and they must be designed carefully to remain both.