Not for many more years to come.
Many of us bought 8tb hdd's for $135 (I think) last black friday; Can you imagine how much an 8tb SSD would cost? or how long it will be before they can make one that big fit on an M2 card? LoL
Long long ago, PC's had no hard drive. They ran directly off floppy disks.
Enter the HDD, and floppies went away. It did take quite a while, though. HDD's were quite expensive.
I remember spending near $200 on a 125 megabyte drive.
Currently, 125MB will hold 3 or 4 pics from my camera.
DVD's took over from CD's.
Solid state storage will eventually take over from spinning drives. Eventually.
It is becoming increasingly easy to buy a system, especially a laptop, that is SSD only.