” to think of other words that had disappeared similarly abruptly.”
None of those words has disappeared. People still use the terms shilling, plus fours, record changer. There is less cause to use them, except in historical writing or perhaps in numistatic publications, baggy trousers collectors blogs etc.
Shilling remains a common word, and there are still coins so known in some countries. It is also a hot item numistatically.
record-changer Googlits: 341000
A bit of Googling indicates that some vinyl enthusiasts still use record-changers.
tuppence Googlits 1610000
Quite often used figuratively, as something of low value.
plus-fours Googlits 4100000
Best news all day. Frabjous Day Callooh Calay, plus-fours are still being manufactured and, presumably, purchased!
The Sutherland Sporting Tweed Company says: “These are generally ordered by people that are purely stalking or requiring a lot of bending and leg movement.”
Who can be mad at the world, knowing there are people out there still loading their Barry Manilow collection on to a record-changer, or doing a bit of stalking in their plus-fours.