You're right. But, we should also do things that matter. This wouldn't. Right now, our horizon is literally 5 years. Anything that doesn't help in the next 5 years needs to get in line, because we've got 50 years of inaction to make up for.
OTOH, I am also not sure what we as a species can do in the next 5 years that actually will matter.
Probably both? At least the first. For integrated circuits, I think lead is a hard pass (for now), and the deposition process needs to be worked out.
Ideally, this could be useful for the hottest paths: clock tree, high-speed buses, as well as the power supplies.
There are a few hurdles though: high-speed voltage changes create changing currents, which creates variable magnetic fields, which IIRC may be a problem depending on the superconductor's characteristics. Processors also work at low voltages, which means that they need huge currents. Both magnetic fields and large current (as well as high temperatures) can break down superconductivity. So it's challenging, but probably doable.
https://news.ycombinator.com/item?id=36836722