Right along with the vacuum tube (readily available on the web in droves) and lp's (several current mfr. of newly released vinyl). Go to the high end audio show in Vegas - about 400+ rooms many consisting of tubes, turntables, vinyl, etc.
Big consumer marketplace? Nah, not like the gazillions that go the main convention hall for CES. But enough for dozens of turntable mfr's and vacuum tubes.
My estimate is the same will hold true for silver based photography...
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