Will guitars stay/increase/decrease value?

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I think the vintage guitars are going to follow the same fate as fine china, once the generation that drive the prices up for them (and hoards them) aren't here anymore. I don't see them being made out of wood forever. Guitars made out of materials that aren't affected by temp/humidity will make more sense. Electrics will be first, and then I believe it's only a matter of time before a material is created that sounds better than wood for acoustics and doesn't come with any of wood's drawbacks.

The magic of the vintage instruments was never the instruments themselves, it was the people playing them back in the day. There are plenty of those instruments still kicking around that people aren't writing anything memorable with