Also I think it in model B the "developed" economy itself is significantly propped up by fiat and therefore more of the development is revealed to not be useful with wide spread adoption of bitcoin. This distinction of A and B scenarios can also be expressed based on a continuum of fiat dependancy. The less reliant on fiat a country or a person the better and scaling solutions improve the reliance ratio for everyone.

For fiat poor nations scaling helps for adoption now. For fiat wealthy, bitcoin scaling and local circular economies are protection against real risks which could even tip the lifeboats.