FWIW, this predates the memristor. There are several types of RAM all trying to replace NAND and DRAM. It seems likely that one will win, with a couple others for niche uses (IIRC MRAM is already favorable for some aerospace applications due to its resistance to switching from cosmic rays).
Memristors are turning into yet another falso hope from HP. They never created a product that is as good as flash, nevermind this newfangled nanotube memory.