Snuffed out?! He was the last guy and no one else apparently wanted to learn it.
Since it was a dialect it’s more about nobody doing it than nobody learning it. Any English speaker probably knows all the words, we just don’t put them together that way. People don’t tend to “learn” dialects, unless you move to a region that has a different dialect than your that’s very prevalent and you’re willing to adapt you’ll speak whatever dialect you grew up on, which for most people these days is “TV news anchor”.