You know, Walmart doesn't have some kind of civic responsibility to provide us with fabric OR to keep other companies in business. As the poster above me mentioned, it's very short-sighted of fabric manufacturers to put all their eggs in one basket. Walmart bought their product for a while and now they are discontinuing that branch of their store. Walmart is JUST A BUSINESS! They are accountable to their stockholders for profits, and if one part of their business continues to lose money, they really need to do something about it.
I have made many many garments and quilts from Walmart fabric, and I have relied on them weekly for thread, interfacings, notions... I will miss it very much when they are gone. It was nice while it lasted. But it's a business, and I wouldn't expect them to go on selling things that are not profitable. It doesn't make sense.