Because you might be able to make more money with a slow introduction rather than a fast one. Restricting supply means you don't cannibalize the existing flash memory market, and can probably still make huge profits from people who must have the best possible performance.
Also, over-investment in production facilities is a huge risk.
Does this pass a sanity test? What they're talking about would be the biggest breakthrough in computing in a generation. The question is not whether there's a market for it. The question is whether it works.
Edit: "the concept of a memristor, that of a large amount of small devices storing chunks of a larger piece of memory" <-- this is not the concept of a memristor. Not even close.
Hopefully it's something like this: If it works, let's sell it, then we can use some money to investigate how does it work and how we can improve it.