My last post on the subject...
You can't predict the future. You can't always know not only what will
be "interesting", but you can't even know what things will mean. Entire
worldviews and paradigms change.
Read Thomas Kuhn's THE STRUCTURE OF SCIENTIFIC REVOLUTIONS, for example.
It's really short.
No matter what we save, or how we save it, it will embody biases,
prejudices, preferences, etc. "Save everything" (sic) as an overriding
philosophy goes towards preventing a lot of knowable and preventable
storage/retreival problems.
It's all moot anyways because there's clearly no will in my country to
think about culture, anyways. You can do what you want.