Ad blocking is already beneficial for the ad industry. The sort of people who install ad blocking are also the type who never interact with ads. The net result is an improved CTR/CPA because ad impressions are not being wasted on someone who would not convert in the first place.
I have always wanted to make an extension which would use a random cookie (from any of the users) instead of just blocking ads. This would totally mess up their targeting and reports. It would not help the ad industry at all.
Given that I have spent years working in the ad industry and writing ad servers, this is somewhat ironic.
Random cookies probably wouldn't suffice. Evercookie[1] uses thirteen different storage mechanisms, making it almost impossible to delete.