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This might sound a bit sinister, but i see one scenario where tube technology could possibly be put back into short term use. I don't want to make this a political post, so lets for the sake of argument say 'Country X' decided that the United States needed to be taught a lesson, and that country has developed or otherwise obtained several medium to high yield nuclear weapons: of which three were detonated at high altitude, one over the northeast, one over the mid-west, and one over the west coast. The resulting EMP would more or less cook most every transistor & integrated circuit for a few hundred miles in all directions. The only way to gather information electronically would be by radio or perhaps analog TV, if any such installations are still in place (assuming active DTV transmitters would have suffered the same fate as all other electronics).
Tube technology was found to be much more resistant to the effect of EMP's. So as those flat-screens, iPhones and digital radios would be instantly rendered useless, that CTC-15 or old Philco radio would probably fire up as if nothing ever happened - or at the very least - be much easier to repair.... assuming of course there would be a way to power it.
A little extreme for a scenario perhaps, but outside of something dramatic like that happening, I don't realistically see CRT's coming back into vogue.
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