The thought of ever-present Walmart blimps is more than a little odd, and there's no guarantee that it'll happen (this is just a patent), but it's more plausible than you might think. Amazon and Walmart have been at each other's throats recently as they try to dominate internet-based shopping, and they've frequently felt compelled to counter each other's moves. If Amazon fulfills its Prime Air ambitions and delivers many of its orders using drones, Walmart might not have much choice but to deploy blimps if it wants to keep up. In short: the skies are about to get very crowded.