It's funny, but I could have sworn I read Intel actually demoing the technology at a media event, that it was already production ready and that it was beating NAND in all the significant measures, density, speed and durability.
The chatter was that it was *so* good that it was being considered as potential augmentation for RAM, allowing for huge RAM cuts in lower end devices since swapping to it would be largely indistinguishable from actual memory access on low end systems. Marginally believable as I have two SSD Skylake laptops running Win 10 with only 8 GB RAM and I've never gotten the itch to jack up RAM amounts because even generic SATA SSD makes paging transparent enough.
Or it was the next fast tier in enterprise storage, which, IMHO, has to be dreading the rise of cheap 3D-NAND largely obsoleting their tiering sales pitches and forcing primary flash storage down in price. I'm sometimes of the opinion that the latest hyperconverged trends have nothing to do with platform vendors aiming at SAN vendors but hardware vendors looking to boost profits by overselling compute by repackaging it as hybrid compute + storage.
I think the other oft-mentioned thing was that 3D Xpoint was actually going to debut in some kind of ultrabook design in Q1 or Q2 of 2017, so it wasn't necessarily going to be a technology dribbled out at high margins to enterprise markets before reaching pro-/consumer levels -- ie, someone had decided that it was all-around good enough that they could just gut the existing NAND market at once. Maybe that's just led to wishful thinking on my part, the idea that there really was a next big thing available universally and able disrupt the entire storage market.