The problem is that any new technology has to compete with half a century of improvement made to the current one. It's not enough to make a proof of concept of

The problem is that any new technology has to compete with half a century of improvement made to the current one. It's not enough to make a proof of concept of your MRAM, FRAM, or whatnot. If you want it to catch on you have to also come up with a way to quickly start making say, 16GB modules competitive with modern DDR5. That's tough.