I believe in “privacy preserving legislation” when I actually see it work. Legislation is Theory-Space, and quite often has no connection to online reality, as the net is international, but laws are not.
I, too, would like to ban ads, but banning them by law will not work unless it is an international law without any holes. Sadly, forcing advertisers into a less invasive mode and make them just rely on the firefox-defined technology is just as illusionary.