If you still doubt this technology, go have a look at the technological advances in hard drives, versus the technological advances of flash in the last 5 years. Hard drive vendors have very little to innovate while flash/rram are at the lower end of a hockey stick figure when it comes to innovation and price reduction. Within the next 5 years, flash/rram will replace disk, both in the enterprise as well as the consumer market.
I'd love to see your all-disk array do 2M IOPS, something that all flash arrays are capable of today. Again, at the price that (with dedupe and compression) comes darn close to your disks. Even legacy storage vendors are increasingly investing in solid state technology. Investing in disk is equal to investing in Greek government bonds.
SSDs follow Moore's law - double the transistors, double the size. You can cheat with TLC and more, but the smaller cells aren't helping. Hard drives aren't restricted to Moore's law which is why their prices can tumble.
As for 2M IOPS, if you're doing that, you need SSD, no question. But if you're doing movie editing where raw speed and basically long stripes of writes take place, you may be better off going with hard drives because you value storage over IOPS. When a CGI scene can start to require several TBs of assets to be loaded for rendering (seriously, the modern movie is already pushing 200+TB of assets just for CGI), 2M IOPS isn't so critical.
And if your business needs 2M IOPS and 8TB of storage at 2M IOPS, there are companies willing to accommodate you, and sure you're going to be paying tens of thousands, but if you're pushing that sort of workload, that's probably well worth the investment.
Anyhow, I can see SMR drives serving as yet another tier in the storage hierarchy - you have the SSD for the hot files, the cooler files get put on a huge regular storage array, and the SMR drives serve as cold files long term near-availability storage, and then you have tape for offline storage. The SSD gets used for the files where they're busy so it's fast, the hard drives serve up older files that are referenced only once in a while, and the SMR serves as a archive pool for files accessed rarely or not at all, just before being dumped to tape.
Or, perhaps SMR drives can be used in high capacity applications where it's mostly read only. Think like a digital download store (music, movies), or Netflix. Updating a single file on an SMR is painful, but if you're going to write a big movie to the disk and everyone's going to be reading from it, a large cheap SMR drive fits the bill because it's going to be read from far more than written to.