I feel we are moving towards technology which will allow everything we see to be stored without need of a handheld camera.
Perhaps when our memory isnt quite what it used to be, we can review everything our eyes saw, reliving joys as well as sorrows.
While not yet practical, the technology foundation at least exists right now. Many mobile devices contain one or more cameras, capable of both still and motion. It should be no problem to add this capability to a device such as Google's enhanced reality glasses, for a continuous information stream of what you see. Storage becomes less and less expensive, while gaining speed. SDXC cards are up to 256GB! While WiFi hot-spots are ubiquitous, most require passwords now. If universal access ever comes about, the local card could easily upload the stream to the cloud at every opportunity. Cell phone technology may be a better route. In any case if the will is there, it is very nearly doable. Local and cloud storage is approaching free. At the moment, a terabyte is going for $50-$80US.
The USA agencies involved in domestic surveillance give us a clue of just how enormous big data can be, clearly dwarfing the vast server farms of Amazon and Google. Certainly, not everyone would buy into recording a life-stream, so the need for storage would continue to evolve, rather than present an immediate storage crisis. Compression of data is amazing now, and I expect research will continue to cram far more into much more into smaller, more efficient packets.
While big data is certainly the wave of the present and future, organization and search would be the problem. With wearable data capture, perhaps one could tag things verbally, while the capture devices also tags by time. Still reliving a random memory from years back when the date is forgotten, could be a problem. With a terabyte of images, only careful indexing and cross referencing through ACDSee Pro keeps them easily accessible. They are of course discrete moments in time. Finding a precise point in the stream of life may be more of a challenge.
Of course, all your mistakes would also be recorded, and may be subject to subpoena. Run a stop-sign last week? The surveillance camera on the corner caught it, and your life-stream would confirm it, leaving you no defense. Then there was that chance encounter with the blonde in the bar when your wife was off visiting her mother, the war department was in session...
