All things must come to an end.
Kodachrome is one of those old technologies that should have been supplanted years ago but couldn't be topped. It's extremely sharp and extremely stable because it is actually black & white film. It's has a three layer silver halide emulsion which does not have the color components built in like other negative and positive color film. This makes for a thinner emulsion and tighter grain. It also makes for an ungodly complicated and finicky chemical process. There have never been more than a few Kodachrome labs in the country at any given time.
E6 film got better and better and by end of the '80s there was finally real competition for Kodachrome from Fuji. While the top E6 films were excellent, Kodachrome still had a unique look. It's color pallete, tonbal range and detail were just different from anything. And AFAIK it still is the most stable color emulsion.
God, how much money did I spend of Kodachrome and processing...
It was worth it.