Abstractly, I do not see how, economically, devolving trust can reduce cost. You pay for trust either to a third party as now or you pay it to the network verif

Abstractly, I do not see how, economically, devolving trust can reduce cost. You pay for trust either to a third party as now or you pay it to the network verifiers. Somewhere there is a cost. Now, keeping all records digitally and openly accessible, and having automated processes to replace human processes, that can certainly reduce cost, but it's a business process change and orthogonal to the blockchain.