Cars are different in that, as you say, once someone who wants one has one they are done. If they actually drove it (and I don't see even the most devoted antique car enthusiast wanting a Model T as a daily driver) it would eventually wear out but the fact is cars are durable goods where film is a supply item for an active photographer. Ford would also face probably insurmountable safety and emissions problems in trying to market a new Model T that would make any EPA hurdles to Kodachrome trivial in comparison.
And Stone, Dwayne's had a large production Kodachrome machine but that's not the only way it can be or was done. Kodak used to market a K-14 mini lab, complete with packaged cubes of chems for small volume labs. At least one if these was bought by an enthusiast who, last I read a few years ago, was sort of scratching his head wondering if it could ever be made useful. Kodachrome processing CAN be and was done on a much smaller scale on much smaller machines. IF (big if) the demand were there an updated version of something like that could be made and used by one or a very few labs to handle smaller volumes.
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