Interestingly I think the typical usage on a single drive for the average user has topped out at about 1-2 TB over the past few years. Unless you are a supreme data hoarder this is more than enough to handle the typical user’s OS, all of it’s software and a decent collection of media (TV, music, movies) in respectable quality. This idea goes a bit out the window if you are talking about ultra high quality media of course, but for me (and I think most average users) 1080p for movies/TV and v0/320kbps level quality for music is more than sufficient.

We will eventually reach the limit on what the human body can perceive in terms of audio and video quality (if we haven’t already yet, I know it’s quite debatable whether there is a perceptible difference between v0 and FLAC for instance) and that coupled with the amount of media a human can reasonably consume in a lifetime might sort of put a cap on the amount of storage needed by the typical consumer. This is of course assuming no new technology like IPFS comes along that might incentivize storing other people’s data or some other similar radical technological innovation.