Personally hopeful it inspires a “gold rush” of funding materials research to get LK99 to a supremely useful spot

I'm hoping for something that isn't made entirely out of a superfund site material, personally.

Unless I misunderstand what you mean / what the stuff is made of, this seems like a huge exaggeration... lead isn't friendly, sure, but it isn't that dangerous? There are worse materials that are in common use. (And we use lead in plenty of places already)