It’s impressive really that a bumbling retail giant like Walmart managed to keep a video streaming business afloat for so long, threatened by ever-increasing and more technically accomplished adversaries. Now the time has come for Walmart to move Vudu on, the platform it bought nine years ago for $100 million, making way for a new wave of lumbering US companies in the OTT video market. History has a habit of repeating itself. Apple, AT&T, Disney and NBCUniversal – all peddling disruptive new OTT video offerings – need to know that just because you were so successful in one field, you are not guaranteed riches in another. Sure, 3 out of 4 have enviable experience in the media market, combibed with…