I'll give the local response, seeing as I'm sitting at work in an office in Bentonville, Arkansas, about 3 miles from the Wal-Mart General Office. I don't work for them, never have, don't own any Wal-Mart stock, but, in the interest of full disclosure, the engineering company I work for gets about 25 percent of our business from Wal-Mart and its subsidiary companies. And, of course, some of the booming local development we engineer is a result of Wal-Mart growth.
Wal-Mart is successful because they sell an cheaper mousetrap at a great price. It does the job, and Americans learned there is no reason to buy a better mousetrap at a higher price. The mouse is just as dead, just as removed from the premises.
As for obselescence and complacency, Wal-Mart is very aware of how that killed other companies. They put a tremendous amount of effort into store design, store replacement, store modernization. They assess market trends down to the rat's whisker in a way you probably wouldn't believe. It is highly unlikely they will lose this drive any time soon.
Yes, they have had some problems with people issues, as any big company would. They seem to be addressing them fairly well, and as fast as any similar behemoth would. Their community involvement is way above most similar companies.
I'll give one example of a Wal-Mart success. For new store construction, they got hit with citations a few years ago for not controlling run-off, which in turn polluted local streams. The regulations were new, and I can tell you for a fact that no one was following them. But, since W-M had deep pockets, they got inspected first and got hit with the fines. They took to heart their obligation to not allow polluted run-off from their construction sites (OK, the possible bigger fines were a huge inducement), and now W-M construction practices are the model that all other construction follows. They are leading the nation in terms of controlling polluted run-off from their construction sites. Good for them.
NDG