This is great news. A hypothetical 500-layer+ NAND could eventually enable enterprise HDD densities on low cost SSDs, I've always been a believer in the SSD tech, and while such extreme capacities would only serve the business segment, a lot of folks who swear by HDDs seem to forget that practically all ultra-high capacity drives are also enterprise grade, they're just inexpensive enough to fit on a regular consumer's pocket.
I hope this breakthrough is achieved, SSDs at the consumer segment have stagnated in capacity, and affordable devices have also stagnated at performance, which while very high, has room to greatly improve.
The mechanical HDD is a technology which should be riding into the sunset at the earliest convenience, IMHO.