I'm shocked that there are so few left of these, but then again, maybe I really shouldn't be, since there seems to be two groups of cars especially prone to going extinct: 1. commercial/public failures ("I'd love to preserve a car, but not an ugly disgusting one that everybody has always hated") and 2. cars that are... unexceptional (as this festival celebrates) - ordinary workhorses, typical family cars without any new innovations, groundbreaking features, or "kewl" design, simply serving their time on the roads before being unceremoniously scrapped without any second thoughts when starting to get worn and weary.
We get so used to seeing these cars absolutely everywhere, that we think that "surely there must still be hordes of them out there, and probably in much better condition than mine", so we take them to the scrapyard, assuming that "others" will take care of preserving their legacy... but when everybody thinks like that, none get preserved and one day, they go extinct.
I really love the concept of a festival of the unexceptional and I wish the concept would catch on and become more common and... unexceptional.