I looked into this a bit and found that it was E6 film in general that cut deeply into Kodachrome sales. AAMOF at that time, Fuji had only just begun selling an E6 film, and their first sale of it was pretty bad as it was incompatible with E6 to some extent. This was a headline cover article in 1990 in Darkroom Techniques.
Fuji actually seems to have withdrawn it from the market for a time.
In addition, an extremely inept, and to some offensive, series of ads by Fuji early on, turned public opinion against them. They were withdrawn with apologies, so there is no need to repeat them here.
Kodachrome 200 was not designed for any particular lens. It was tested routinely with a series of Kodak Carousel projectors. We used to watch them in the screening room of B-59, on the first floor where they had a complete projection studio with many types of projectors and screens.