I think it's difficult to get away from the prospect of a practical widespread use of superconductors without active cooling. Even if ohmic losses in the super

I think it's difficult to get away from the prospect of a practical widespread use of superconductors without active cooling. Even if ohmic losses in the superconductors is not present: environmental temperatures change, especially in uncontrolled (outside, in the sun) environments. Running room temperature water adds cost and complexity, but a lot less than refrigerant (especially cryogenic). I think mass produceable room temperature superconductors would still reshape the world, even if they still required active cooling.