In theory, we could have had a much better power grid with more transmission. The reasons we don't have nothing to do with the price of aluminium, or the resistive losses of it. It's just difficult to build large-scale infrastructure. Transmission projects typically spend longer in court than actually building them. Superconductors would not change a thing, unless it changed that.
No, switching from raw aluminium to an obscure synthesised compound is not going to be worth it for a few % efficieny gain. We've had centuries of "scale up" with copper and it's still not worth it.
I'm 100% convinced this fad will pass and you will only see screen-only UIs in low-end cars. Premium cars will all have physical controls for the most important features.