Clearly they are playing catch-up -- Amazon is eating them alive through online ordering, and has a growth curve that is rightly extremely frightening for Walmart. Walmart is already operating by the skin of its teeth (a net margin pushing below 1%, while Amazon's has pushed past 4% and has been heading upwards) and Amazon threatens that more as people buy more and more of those "oh right" things through the online retailer.

Culturally, though, Walmart has absolutely no chance. I recently purchased my first online order through Walmart as they had a product no one else in the country had. It came busted and spilled out in the bag. I emailed just to make them aware that this happened and the hostile, "PROVE IT" type response I got was so incredible compared to Amazon's facilitation of the customer. Walmart culturally will never have a "oh you didn't like it that's fine just stuff it in a box here's a label and a we've issued a full refund" response to anything.