based on the IBM model M. You will not need a new keyboard again for a good many years.
Model M keyboards do not 'die'. On occasion, one will be called to Valhalla to feast with the heroes of legend for eternity; so replacements aren't out of the question; but that's pretty much the only failure mode.
Not the only one. I have one that has several non-functional keys because enough of the plastic rivets that hold the metal plate to the internal plastic board have failed, producing a warp. There is probably some technique to re-attach it, but I haven't found one yet. 30 years ain't bad for plastic rivets, but clearly they have a limited lifespan.