If Drucker and Bennis and Collins and Peters and Co. (charter members of Guru Nation) are/were so damn smart-wise, why is corporate performance so shabby in general? Hint: "'They' [biz leaders] don't listen" is no kind of answer. If "they" don't listen, then the "solutions" were not actionable by "real people" under stress.
Just a [crappy] thought. (It came to mind when I took part in a Drucker tribute last week. "Ahead of his time" was a constant refrain—well, if you're so far ahead of your time that few do anything with your stuff, then ...)