The last stand for arrays
The high latency of SAN compared to SSDs means block storage users like databases are slowly but inexorably moving to shared-nothing, direct attach (DAS) architectures like PCIe and NVMe, with the networking being handled at a higher level by the database itself. Aerospike and Spark are good examples of this trend.
NAS is the only way storage vendors can still peddle expensive and increasingly irrelevant storage arrays. The other is acting as a premium backend for virtualization (i.e. vMotion), and that's being eaten up by software as well.