The high-definition disc battle is over, and Blu-ray has won. We can now move on to more productive matters. Why am I declaring victory? Not because of Warner's switch to the format, and certainly not because of Netflix's. Retailing is not a democracy. There is one vote that matters. No, it's not the consumer's — it's Wal-Mart's. And Wal-Mart, formerly an HD-DVD advocate, is going Blu. Walmart.com currently has its sole HD-DVD player model on clearance, and by June, it will only sell Blu-ray players and discs. Next format war, please.