This is disingenuous, I think. Of course they don’t exist at the necessary scale yet, because the market is small. If the market grew, and was profitable, scaling would be possible. Rare earths aren’t rare enough to be a real constraint, we’d just need to mine more of them. The only thing needed would be to make more of things we know how to make. (And no, that wouldn’t happen, because the new tech being developed would get developed far faster, and used instead.)
This is disingenuous, I think. Of course they don’t exist at the necessary scale yet, because the market is small. If the market grew, and was profitable, scaling would be possible. Rare earths aren’t rare enough to be a real constraint, we’d just need to mine more of them. The only thing needed would be to make more of things we know how to make. (And no, that wouldn’t happen, because the new tech being developed would get developed far faster, and used instead.)