HDD manufacturers are scrambling over the remaining crumbs. Drives have too much capacity for the price, so no one is going to bother to get into the business, because there are no profits left to be had. More and more will end up on SSD, so long as there is technical progress to make SSD better at things like random reads, and in write lifespan, and perhaps eliminating the need for trim and wear leveling.
For me, HDD serves me just fine, and I tend to use SD cards for my data, because Ican custom the SD storage, and plug and go with whatever tasks I want. I do like having portable applications because they do not lock me into having to install software on a bunch of machines, and I don't have to muss and fuss over it once installed. Of course, there is a "performance hit", but for those apps, I don't care about a few extra seconds, simply because I save on having to install and update a suite of software on a number of machines.
I have seen scads of failures on all kinds of HDDs over the years, sometimes because of abuse, sometimes because of systematic design defects. Each failure alters my next purchase. But I can see that SSDs, so improved, will easily become the basic drive unit for OSes and core apps; and fast SD cards (or whatever format) are fast enough for other non-core apps and data - leaving HDDs for repositories and libraries - where they will rule the roost only because the cost per GB is no low.