Hey Rick -- Thanks for reading my post. I like your phrase "many a great idea has gone nowhere because of marketing deficiencies." We see that often in thought leadership marketing: an expert or team of experts with a new, proven way to solve some problem but who a) can't explain it clearly and compellingly, and b) don't do much to get their idea into the marketplace.
You also said, "It's nice to see that the marketing sector has made the list." Isn't it ironic that one of the last sectors to market itself on the basis of thought leadership -- i.e., of explaining its expertise -- is the advertising sector? Maybe the professional demands of writing a one-page ad or 30-second jingle -- and I mean that sincerely -- has closed many marketers' minds to other ways of convincing an audience to adopt something.