I doubt we will win anything from this. Some advertising provider will provide an easily-runnable proxy and say "we give you double CPM if you give us the logged-in user's email address". Now you have even less privacy.
Third-party requests with cookies made it easy to start tracking people across sites... but there are other ways if that is made to stop working. Given how much money flows through the advertising industry, I am sure someone will pay for the week or so of engineering to make advertising more invasive.
Just georestrict your website to not allow visitors from Europe. What I learned from the whole Blizzard fiasco is that the future is selling products to China. China doesn't really care about the GDPR.
Third-party requests with cookies made it easy to start tracking people across sites... but there are other ways if that is made to stop working. Given how much money flows through the advertising industry, I am sure someone will pay for the week or so of engineering to make advertising more invasive.