You could make exactly the same comment in regard to clicking ads and buying things from ads. If everybody stopped doing that then ads would become valueless and ad revenue would go away. The thing is, a lot of people who use ad block never click on ads to start with.

The idea that people should be forced to suffer, by viewing ads that are useless to them, in exchange for viewing free content is a very silly concept born of puritanical ideals. If a site can't sustain itself with users running ad block then it needs to figure out a better business model, period.