In this past year alone, I have done more HDD installs than prior years.  I think the price for mass storage has dropped this year and people need or want the space for more apps and games.  I installed no less than 3 SSD this year, 2 - 1 TB Samsung the client purchased them from Best Buy for $99 US each, and 1 - 250 GB PNY the client bought online for less than $30 US.  The 250 GB HD is running the OS and they have 2 old 1 TB grinders, a 10 year old Hitachi and newer Seagate.... Seagate is sneaky and don't print the date normal, they encode it. 

I recently had a repeat customer, first he asked me to save a damaged 1 TB HDD.  I explained, it was beyond my ability to do that but he could pay a mail order service, they would attempt to salvage what they could.  No, he didn't want to go that route, I suspect it was full of porn, pirated movies, or games, since he asked if they would look at his data.  o.O Yes, and I never look at the customer's data?  After he purchased a new 2 TB HDD for his old PC, I install his Windows 10 on it and thought I was done.  He called me back, "Bought this new gaming drive can you clone it?".  Problem was, he purchased a Western Digital Black 10 TB HDD and his old PC didn't support UEFI.  I tried to tell him just to send it back, he was only using 84 GB of the 2 TB HDD!  I left again thinking he would do the right thing, the logical thing.  Nope.  He now had purchased a newer but still older PC and the same model as well.  This one supported UEFI, I cloned the HDD overnight, came back and install all the memory from his old PC to the new one.  When I finally left he was running twice as much RAM, a 10 TB HDD, Nvidia Graphics, Windows  10, plus spare parts from the old PC, and he would have been better off buying a brand new gaming machine from the store instead.

There will eventually be a surplus of large grinder HDD on the market cheap.  Depending on the wear and tear, they could last you a very long time to come.  I think with the speeds increasing on the SATA SSDs and the price dropping, people will be buying them up.  The only drawback I can see is the longevity of the SSD is probably 50% shorter. When they do go bad, they will end up in landfills instead of being refurbished.  With the old spiny grinders there is so much metal in them they can be melted down and recycle for scrap.

I am running a 2 TB seagate myself.