In the next year or two (anyone’s guess is valid at this point) Facebook will be releasing a smartphone by HTC according to AllThingsD. Its codename: Buffy. Nobody can predict the future, but a combination of common sense, reality, and historical precedent point to the probability that a phone that focuses so acutely on Facebook will fail miserably. Here’s why: Niche phones are niche The 2nd biggest reason (with the biggest reason being price) that hyped gadgets fail is that they tighten their niche too much. Items like the Zune, HP Touchpad, and Playstation phone put too much emphasis on what…