Nostalgia aside, there is one item that is at risk of disappearing within a decade or two for which society will be much worse off: that is cash. I mean physical money that is accepted by almost everybody, available to everybody, anonymous, and not tied to some corporation like every other payment system. Cash disappearing would be like freedom of speech disappearing. Many people would not notice but I think society would lose a lot of liberty.

Well, I suppose cryptocurrencies in theory could replace the role of cash but they are immensely far away from being "accepted by almost everybody".