revisiting this topic...
ok, so 4TB regular hard drives can be had for about $200-300.
1TB SSD is over $400
If the analysis involves storage capacity, the SSDs don't stand a chance unless you are willing to fork over 4x more for them. And with 8TB and 10TB coming out soon...I just don't see the "end" anywhere near.
Currently, and for the near future, they seem to serve two different purposes. The only market that the SSD took over is the non-techie consumer market (a large one, however, lol). People who don't use computers much now can get desktops with SSD instead of the big mechanical drive. And for external use, most are also going with the SSD for good reason, even over the similar form factor 2.5 mechanical drive. But for actual hardcore use, massive storage, enterprise etc. the mechanical drive is still king by a longshot.
An 8TB single drive is a beautiful thing.
The whole storage industry is nutz right now. The capacities and form factors are unbelievable. I just got a 128GB microSD card for under $100. It's the size of my pinky nail. With this kind of storage power, it may be the end of the world, but not the end of the mechanical drive!