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It's hard to say what is the most important factor in preserving CRT life...it probably is mostly in the tube itself. I do know that computer monitors tend to last longer when switched off at the end of the work day rather than left on constantly.
The case for instant-on seems to be that it eliminates filament turn-on stress (which it does) but that doesn't seem to be a major problem in tube failure (as it is in light bulbs for example). Most of the problems with weak CRT's seems to be in weak emission; and the instant-on circuit, by keeping the cathode hot, would seem to wear down the emissive properties of the cathode even in the standby state. However, on the instant-on sets I have, out of say 10-15 sets only one seems to have a worn-out CRT.
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