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In all honesty I would worry more about the supporting electronics than I would about the CRT, capacitors, both electrolytic and surface mount can deteriorate in storage, it's probably a good idea to fire up a set every few months for an hour or so to keep them in good shape.
A tube with a lot of hours on it can "go to sleep" if it's stored for years but a tube in good shape should work as well in 50 years as it does now.
I have 50 year old tubes that were never used and still work like new.
The biggest danger is it will lose vacuum but that is rare especially on modern all glass tubes.
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