I already see support and customer service offered through WhatsApp or emphasizing chat/email. The switch doesn't have to be frictionless, it just has to be les

I already see support and customer service offered through WhatsApp or emphasizing chat/email. The switch doesn't have to be frictionless, it just has to be less painful than spam. It doesn't need to happen all at once, either. We're already seeing early adopters walk away from PSTN, so unless they can fix the spam situation before the alternatives hit an inflection point, PSTN is doomed. I'm sure it will live on in many places that aren't concerned with customer satisfaction, though.