SSD prices are still too high to abandon HDD.
Of course hard drive companies aren't stupid, their strongest area is high capacity low performance applications (backups, nearline storage, archiving, etc) so HDD are going to get much bigger to stay competitive. So it is win-win all around. Still if I was WD I would be looking to buy a flash company.
And this is where UEFI & GPT partition tables come into place
.i have a 128 GB ssd drive that i bought for $65 a year ago.. i don't think it has been worth it so far. i usually have anywhere between 45 to 53GB free, but i often end up deleting stuff or storing on my portable HDD.
Look into hyperduo http://www.marvell.com/storage/system-solutions/sata-controllers/hyperduo/
&
Intel® Smart Response Technology
http://www.intel.com/content/www/us/en/architecture-and-technology/smart-response-technology.html
HDD cannot improve much further but ssd can.
SSD is at 8 electrons per bit so only three more very very difficult doublings. They are working on some other tricks.HDD has HAMR, SMR, HAMR+SMR, pattern media, other tricks.
About the same horizons on both.
Other tricks, check out https://www.samsung.com/ch/business-images/resource/white-paper/2014/01/Whitepaper-Samsung_SSD_Rapid_Mode-0.pdf
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looks of it, Death and taxes & Burtw knows their shit.
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Publicity at best, hdd isn't going any where. SSD's has only so much life to live vs a hdd, not including hardware failures for both.
Edited: a few times.