Well I haven't bought a roll of Kodachrome at the full price for years. I usually find it in rummage bins, slightly out-of-date or nearly out-of-date. At £12+ for 36 exposures it's out of my price range.
I exposed a couple of rolls (one 64, one 200) this year, and I was impressed by the subtlety of the colours, and of course those stand-out reds, it reminded me why I always preferred it for chromes. Like many, I want the 120 version back - I only ever exposed one roll but was stunned by the quality. Although I'm impressed with the Ektachrome 100VS, I'd definitely pay a premium to load that into my Bronica!
Something I was toying with - and actually tried this summer with HIE - was adapting my old TLR for 35mm film using the full height of the image area. Just think - 56mm wide panoramic Kodachromes. That, and a few impressive landscapes, might tempt me to use more of it.
But how to increase its popularity? Advertise? Kodak would probably be seen by the uninformed as old-fashioned and backward-looking. Maybe the aforementioned Lomo / Diana etc. crowd would buy it. And any association with them might turn the uninformed consumer further away from it. All IMO, of course.
So I doubt there are any easy answers but I'll certainly miss the stuff if it vanishes. And I see that an Amazon.co.uk seller is selling two-for-one...