Good point about the 35s, and a lot of MF was used lightly by amateurs too.
I think color neg will last a lot longer than color transparency but neither is all that promising - unfortunately. Shooting Kodachrome last year reminded me what awesome stuff it was, and casting around trying out E6 films for my "restart of photography" after being out for more than 10 years lead me to Astia, which went away in 35mm after one roll on my part, and then to E100G which I really, really like. I should probably stock up on it.
I think the motivating factor is that for 99% of the population their cheap box type 35mm camera was good enough, that cheap box camera was replaced with a cheap digital camera or a cell phone camera. That knocked the stuffing out of the colour film industry, it's had a much smaller effect on B&W because B&W moved away from the cheap market decades ago.
What I fear is that when Hollywood moves away from film completely, that companies like Kodak and Fuji will not want to maintain the coating facilities for the small amount of film they still will produce. This is the best time to get into LF, equipment is cheap because demand is relatively low, in the future when film gets harder to find, you can always roll your own onto plain acetate or even glass.
