cleeds---when I last attempted to determine the remaining manufacturers of (receiving type) vacuum tubes some 18 months ago, there were zero based in the USA. That's fact. You now indicate that "Domestic tube manufacturing lives." WHERE does it live? Who has entered the business? Do appreciate that I'm talking about manufacturing. That excludes domestic importers that do some tube matching and then resell, often using a private brand label.
It's true that tube usage within the world-wide sphere of the consumer electronics market is insignificant. It's also true that tube usage within the audio equipment market is but a tiny fraction of the net business. It's of significance only to an isolated group of select consumers and sellers with needs that might never get served if it was not for the guitar people. That does not look like a healthy forecast for the future, so stock up now!
It's true that tube usage within the world-wide sphere of the consumer electronics market is insignificant. It's also true that tube usage within the audio equipment market is but a tiny fraction of the net business. It's of significance only to an isolated group of select consumers and sellers with needs that might never get served if it was not for the guitar people. That does not look like a healthy forecast for the future, so stock up now!