What happens when the brightness knob is turned all the way down? Would that prolong the life of the CRT?

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you wont be able to use it but yes it may prolong the crt visually, on a monochrome screen I dont think it is as big of a deal cause the pixels are so much larger physically vs a 3 color per pixel screen (course monochrome screens tend to burn in easier too)

The way you describe it, I should set my 128K Mac up in a vacuum sealed room similar to the CIA computer room in Mission Impossible. A protected and regulated power source, temperature and humidity controlled, with HEPA filtered air, UV light filters and possibly minimal O2 mixture to inhibit the oxidation of the plastic compounds.

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Ideally yes, that is why they make those kind's of rooms (although MI's is a movie exaggeration) but its not realistic ,

but you can also sorta mimic some of the attributes of a CIA room, temp is generally easy in a residence, humidity can be handled with a k-mart machine, and filtered power can come from a good solid surge suppressor (often the big ones have big caps) or a battery backup

Is it really necessary? that depends on your end goal

me, its a 2$ power strip and a good dusting on the inside every once in a while

or... think of it this way, if your using it, when (lets say) a cap or battery craps out, least it doesnt have years or even decades to eat into the board