Ambient temp superconductivity is a great dream. I think it may be accomplished in a relatively short time horizon. When it happens, there will have to be changes in federal law (and that falls under the interstate commerce clause) to consolidate the entire electrical distribution grid (single entity, owned in common by power producers, with publicly traded stock as well) and replace it (longer trunk lines first) with superconducting lines. The estimates for line transmission losses I’ve seen are as high as 70 percent, and if that’s an accurate estimate, replacing the grid in this way would literally triple generating capacity. That’s the only feasible way to replace the internal combustion engine in vehicular transport.