During the first decade of the 21st century, Walmart went ridiculously crazy and was throwing up new stores, I think on the average of three per week. Those were their peek years when it seemed they would never even slow down, let alone fail.
Shoppers were flocking those stores, literally, all day long. And the company was getting into everything: They were doing used car sales, dabbles in real estate, they tried getting into banking (THAT failed miserably) - at one point they were even selling coffins and cremation urns on line!
Like ancient Rome, they were set on conquering the world.
And now all that gluttony has caught up with them. It's the classic cycle of greed. Make a few bucks, radically over spend to get more, and voila—end up with mountains of debt and having to sell off properties and assets at fire sale prices.
Walmart's not going out of business, but the model we've seen in our lives will be GREATLY different in the coming months and years.
My prediction is their store numbers will be reduced by at least a third within the next three years.