Not since “New Coke” has Coca-Cola insisted on being so wrongheaded. “New” Coke lasted just 79 days before Coke customers rebelled and the company was forced to revert to the original recipe."The simple fact is that all of the time and money and skill poured into consumer research on a new Coca-Cola could not measure or reveal the depth and abiding emotional attachment to original Coca-Cola felt by so many people." Donald R. Keough, then Coca-Cola President.The embarrassing flop went on to replace Ford’s Edsel as the #1 marketing blunder of the ages. Just 6 years ago, on the occasion...