Bmused,
I hear you, but seeing where the article comes from. . .
Anyway, isn't there a new ruling in the making concerning LROPS (Long range. . .)? I guess that would bring new advantages to the quads, especially on high-terrain routes like across the Himalayas.
One thing is sure: you won't find me in a twin on a route with a potential diversion time of 180 min or more.