I think just about everything will have SOME sort of collectibility to someone... while certain cars undoubtedly have more of a following than others, it seems regardless of what make, model, etc. something is, there is a die-hard following out there that will be interested in pristine examples, as examplified by the 28k Typhoon you mentioned. Those were quick little trucks, and most of them have long since been wrecked, cut up, or rotted away... so yeah, I can see where an unmolested low-milage original would be worth alot to someone interested in them. Those were only made for a couple years, and there aren't that many left. Ever notice how whenever GM gets something "right" they stop producing it a year or 2 later?
