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he availability of Nintendo's Wii U on Black Friday and Cyber Monday was source of déjà vu. Much like the 2006 release of the original Wii, diehard video gamers have been chattering about trying out the console's powerful new graphics and novel input device. Sales, not surprisingly, have gotten off to a strong start. The company has already sold an estimated 400,000 units. Many retailers had trouble keeping the game machine in stock. At first glance, it may seem like Nintendo's (NTDOY) Wii U is starting the video game console cycle all over again. New versions of the Microsoft (MSFT) Xbox and Sony (SNE) PlayStation are slated to arrive next year, and their first-weekend introductions are likely to be just as eventful. But the long-term outlook for these devices is...