Ads have effectively disappeared for a number of years now for those who use a sensible approach to ad blocking (i.e. a combination of ingress blocking, DNS blacklists and browser-based blocking). This could change if content providers start using different approaches to ad insertion - e.g. video ads merged into the original content, ads as part of original page content - but even those avenues will be neutered within not too long. It probably makes sense for ad purveyors to not fret too much over ad blocking users since these users often react negatively to advertising and as such are better left alone.