I kinda wonder if the drop of C41 and slide is also because the people who stuck with or came back to film tend to be the type that does home development anyways.

I'm with CGW on the toy camera users and snobbery; neither will save film. Fads fade and the mightier-than-thou in comparing resolution charts and stuff will one day be squandered by technology advancements. I prefer holding my shots and the act of using film cameras and the darkroom, and I think that group will probably never fade. Probably getting near the lower end of the decline curve I would guess.