"Available darkness" photography (updated)

Interesting double-article about how much sensitivity we need, or not, in our cameras.
"Digital sensors have better reciprocity characteristics, so my exposure times have dropped a lot the past few years; rarely do I need to go beyond a minute these days. Nonetheless, my style remains the same and the results are still artistically satisfying. Would I jump at ISO 100K? Not particularly; I'm okay with tripods and a couple of minutes between frames.
BUT...
There are lots of photos I don't make because the subject matter won't sit still for large numbers of seconds. Do I think having 1,000 times the ISO I now use would open up all sorts of artistic opportunities? Hell, yeah! Is it artistically, conceptually, and philosophically valid? Double-hell, yeah! Photography's never been merely about photographing what you could see; it's always been about photographing what you wanted to see."
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Update: Michael Johnston has expanded on the theme today.