1TB ssd $3,000-$4,000 vs 3TB HDD $230(77/1tb) Prices from newegg at the time of writing. Thats ~45 times as expensive.
The day SSDs replace HDDS are still long off into the future, IF ever. HDDs will always be cheaper to produce, they are much simpler. Eliminating the common parts you have a couple platters VS having to make 100-200 memory dies, stack them up 1-8 high into memory chips, then package them, and put them onto a board. Not counting the controller(both have controllers but the ssd one is much more complex). That process will always be many times more $$.
SSDs just make no sense for consumer media storage. They have their place, but mass storage isnt it, and likely NEVER will be it. Maybe if for some wierd reason media files stayed static in size. But that will never happen, games will continue to get much larger, media files will get larger etc.