Do Not Track is a detrimental policy that undermines the economic foundation of the Internet.
-Daniel Castro, ITIF senior analyst
[For sake of this discussion, let's say that "web service" means a website or other Internet service that does not involve multimedia data like movies, games, and music. Such multimedia services require immense funding because of the nature of what they sell. Braingle.com and any web forum are good examples of what this discussion considers web services.]
The need for advertising implies that web services are not good enough to entice users to support them. If the service is good enough, people will pay to support it. Let the ones that are unpopular die. Sounds like an economics exercise, yes? If it's good, it will succeed. If not, it will fail.
We shouldn't have to have trackers for advertising. The only web services that should exist are ones that are user-funded so as to not have to resort to invasive advertising schemes. Practice of such a philosophy would create a sort of "web service survival of the fittest" situation, and the amount of crapola on the Internet would decrease greatly.