Paywalls erode (or, their ability to gauge and adjust to price signals properly weakens) as the marginal value of the digital goods behind them decreases. The marginal value of digital good decreases when 1) too little money chases a surplus of content; or 2) other options (Netflix, Sling TV, piracy, or weak demand) become opportunities for greater value to consumers.
When the fake can’t overcome the real thing, its only option is to get real. However the upper echelon of the I Can’t Believe It’s Not The Republican Party has no interest in this kind of analysis. Therefore, the party has no interest in reality.