This is the reason old spinning harddrive are not going to die anytime soon. The storage and cost per gigabyte is just to good not to use. SSDs are getting larger but they too are going to hit a limit when they can not shrink more and get stuck. I do not see this as a problem because storage on SSDs are now big enough for most users.
If you need lots of more space you just use a older spinning harddrive, internal or external. Depending on what you need is.
Another thing is that research have proven that data stored on older tech harddrives is safe for a longer time than SSDs, and even if the harddrive where to get damaged, the motor breaks down etc, you can still rescue the data in most cases.
But these large and expensive drives are probably mostly for backup systems, or long term storage, data that does not need to be accessed any time soon.