Sears died because of Lampert, that's the beginning and end of the story. While they were far from perfect, post-Kmart "acquisition" both the service and stores became garbage and he used Sears as a personal slush fund.
Couple of HN links with the opposite slant to this article:
Probably far too little, far too late...
http://www.nbcnews.com/id/6509683/ns/business-stocks_and_eco...
--Lampert, probably...
I strongly disagree; 30 years ago, 1989. KMart had the popularity and store count in the SE that Walmart didn't. Sears was the top destination (and even still had its booming catalog business)
20-25 years ago seems more accurate.