I will try a tiny answer, however.
There's actually a link between increasing open data and the data-intensive research, referred to as big data. There'll be a point when there will be so much data, it won't be that we won't know what to do with it but we won't know how to handle it. There will have to be decisions made as to what is kept and how. I think that actually is linked to your question.
We may not necessarily stop gathering data or the data collection may end up being a little more focused if we get archivists into the equation, saying, “Well, think about what you want to collect and how you want to keep it and the reason why you want to keep it.” That may determine the policy.