This feeling has swept over me, too. We didn't fully realize it at the time, but it was the twilight of our culture being transmitted through "big", tangible products with a distinct publishing apparatus like those demo CDs, VHS tapes, books, newspapers, TV programs etc. Everything went online and became both more available and harder to appreciate - although the old stuff has never gone away entirely, it's just waiting for us to look up from the screen now and then.