I can't figure out how to search for it, but I was under the impression that a manufacturer is required to have a minimum number of spare parts up to 7 years after the end of the production run.
Also, at 4000 cars, it doesn't really seem to be limited production. I know of a couple ~1300 or less Ferrari and Porsche models for which parts are readily available. I don't see why it should be a problem with this car.
Greg A