Think of all the workarounds that we have to use to offset the waste heat and signal degradation of electricity (everywhere, including your computer/phone), and now imagine those things not existing.
This assumes superconducting wires everywhere. I don't really see it happenning in microelectronics for example. You'd have to replace the entire silicon ecosystem with this new material. Not happening soon, probably never.
But sure, for specific applications an increase to 'near 100%' efficiency could have important secondary effects, eliminating heat-sinks, etc.
