Vinyl doesn't have the difficulty of film manufacturing however. But, good news anyways.
I even have a friend who wanted a turntable just because it looked cool, dropped the idea when I told him to invest good money in it so it isn't just a novelty. There is a renaissance towards some analog media because of its characteristics. There was a book "revenge of analog" which seems to talk about it, and perhaps I should grab it to read.
Indeed, just let the "natural" rules of the capitalist market do their think. Possible profit seen, company manufacturing to fill that niche.
As of MF. Cosina-Fuji did the Bessa III-GF670 series, the Mamiya 7 prices have increased from 1000 to 2000 in a couple years, Contax 645 always were up high. Perhaps soon some manufacturer may find feasible releasing a f2-2.8 medium format camera out there.
Thing is that some of these originally $3K cameras (M7) fell in value but returned to their prices when they were new.
35mm wise, Fuji had the Klasse until pretty recently, but doesn't seem to have the same value as the contax T. Took a look at ebay for contax T2-3 prices, yikes!
Then there are other corners, like midrange Af SLRs from 1990 which are pretty cheap.