If you read the entire article, it explains that the metal they use for this to work is highly inexpensive and is already in use for other materials today. Assuming that internet speeds, disk writing speeds, and disk reading speeds i, and hard drive space increase along with the technology, it should all come together correctly.
Though Sub feels by this time, or the technology after, we'll move into strictly digital distribution. Which wouldn't surprise me (assuming download speeds increase and aren't as they are today). Let's face it, downloading a 25 TB movie or game, with today's internet speeds being anywhere between 100kb-1mb per second; it will take awhile.