Seems a little past it's prime. Why would you want this when you have the internet?
What if I could hand you the totality of Netflix, iTunes, etc.? Not wait for it to download, but transfer large chunks of the Internet in seconds? and no longer have to hope that, say, Netflix won't lose vast sections of their library for contractual reasons (as it has done of late)?
Backups: permanent archiving of everything you have all on one disc.
It makes vast swaths of data yours, in your hand, under your control, in a ridiculously compact & cheap media. No more hoping that you can get X in time, or that it will be there some time hence.
I've seen profound transformations in computing when cheap fast storage increased by an order of magnitude of orders of magnitude. This will bring that about again, to similarly disruptive and amazing results.
Totally side-steps last mile monopolies as well. Don't want to work with us? We'll drop an LTE chipset in as well for the admin stuff. Redbox In Your Home.
You cannot buy a three thousand Gbps internet connection.
You would read from that plastic disc just like a CD or DVD, i.e. as you consume the content. This makes the throughput of any link in this chain irrelevant. (I guess except the read speed of the plastic disc)
Who's going to store data on something that will erase portions of itself when dropped? Consumers won't, because they won't know what to do when their 50,000 movies suddenly start skipping ten minute chunks. Scientists won't use it because they want strong guarantees on retrievability, and won't want to bother with stringent protocols on handling the media when other options exist. Logging systems might have a use for it, if they can stand potentially losing big chunks of data.
How often were you going to swap discs? When you got SESSION COUNT EXCEEDED, or UDF timeouts? Every time you give contact info...'and here is a capsule intelligence of things you may wish to contact me about in the next 15 years...but just call.'
Skip most of the spinning and size, put it in a fat SIM card, and have recovery pipelines (cleanroom et al) for failures. If you throw down for the 8TB (not really 8TiB) multiplatter +9 Fondleslab Of Regret maybe you can throw in the service premium to go visit the one retailer the future holds for us, do key exchanges, and have them print out a scan of peak versions of your besties, or let you write Abnormal_brain on the top with a marker?