There is no shortage of forgettable anythings. If that was your point, it's a poor one. If you could predict ahead of time what might be valued in the future,

There is no shortage of forgettable anythings. If that was your point, it's a poor one. If you could predict ahead of time what might be valued in the future, then you could discard the rest. But you cannot do that, since you are not from the future. Scraps of data once thrown away as mundane are now valued in the present by researchers; there is no reason to believe this won't continue to be true into the future. Even your poorly contrived example of mundane data was debunked easily by another commenter. Keep what can reasonably be kept, and let future researchers worry about filtering it. Preemptive filtering will only deprive future researchers of data they'll desire for reasons you cannot presently fathom.