Whatever happened to memristors? For a little while they were going to change computing. And, I haven't heard about them since.

Intel has the Optane drives but I think anyone in need just pays for the ram.

That is because it is cool theoretically but not useful in practice. Every organic material is a memristor and even good memristors are not scalable.

RRAM resistive switching is the far more useful property and this has already been investigated extensively.