This is from 2004. So 12 years ago. $500/gb. Do you know what $500 buys now? http://www.newegg.ca/Product/Product.aspx?Item=N82E16820233766&cm_re=512gb_flash_drive-_-20-233-766-_-Product
2 512GB usb sticks. That's 1/1000th of the price in 12 years!
Now think... in 10 years do you really think 100TB will cost much more than $100? And will the blockchain even be that big??
I remember buying 256 MB pen drives a decade ago, now I'm buying 32 GB pen drives for the same price, and they run at faster speeds than the old ones. In another ten years I'll be buying 3 TB pen drives for the same price, and there will be 30 TB pen drives available that I refuse to pay for until their price drops.