> One thing I find fascinating, and have not seen discussed, is what will happen to all this data in, say, a couple hundred years.

That's odd. I see it brought up on HN quite frequently. And, frankly, I feel like the implicit tone is always that this data needs to be preserved to allow for the insights of future historians.

Personally, I sit on the opposite side of that fence. The inquisition of future historians does not hold weight against the privacy and well-being of the now-living.