I think 100 TB hard drive will become commercially available probably 10-15 years from now. It will be an enormous capacity for a hard drive but will be necessary for streaming media. I think network connections will improve fast rate because capacity of the 100 TB hard drives. Also with the hard drive you will be able to you will be combine HDTV PVR's, MP3 players, DVD archives, and pictures into a giant media database. Transferring that much data from one machine to another may prove to be the hardest part of all when dealing with the device.
The RAM that you be able to purchase for $100.00 in the next ten years I imagine would be 8 tb or more because drives are becoming even more bigger. Like for instance today you can buy a 250GB for under $60 dollars. So I’m guessing it would be more cheaper from the information I gather that the hard drive will be inexpensive to buy but depending on what size do you get.
"the number of components in integrated circuits had doubled every year from the invention of the integrated circuit in 1958 until 1965 and predicted that the trend would continue "for at least ten years"".
and
"the 2010 update to the International Technology Roadmap for Semiconductors has growth slowing at the end of 2013, after which time transistor counts and densities are to double only every 3 years."
In other words, you get approximately double the power, every three years, for the same price.
So if you can buy 4GB of RAM for 100$ today, 10 years from now you'd get approximately ((4*2)*2)*2=32GB of RAM for the same