Availability of alternative business models doesn't matter. They'll just make advertisers pay even more money to reach an audience with disposable income and willingness to spend it. The fact is some executive is always going to show up and say "think of all the money we could be making if we just served ads and sold our user data in addition to our current business model!"

The answer is to make ads unprofitable. When someone pays for advertising, they must get no return on their investment. Only then will ads disappear from the web. In order to achieve this, all ads must be blocked automatically and by default, no exceptions must be made, and the blocker software must be pre-installed for all users.