I grew up poor. We didn't have cable TV, or any kind of subscription service, because we couldn't afford it. My parents would never had justified micro-paying for online content. But through advertising, a world of content beyond what was available in public libraries was made available to me.

Advertising will never go away anymore than money or prices will go away, because even in post-scarcity goods world, people's attention span is still scarce, and anyone seeking to scale any business or organization in this world will need to reach people, and with so many people vying for attention, undoubtedly, differential time-preference and privacy-preferences between people will mean some people will trade one for the other, human diversity practically guarantees it.