The demand for this technology is there, as demonstrated by the popularity of 3D films. The availability of the technology to the consumer audience at the price point that will spark widespread adoption is not.
The technology was developed and released at a time when consumers have little extra money to adopt the technology. Alongside that, the distribution model for 3DTV is flawed, demanding a clear chain of the 3DTV capable devices all be purchased in order to enable the functionality. Finally, there's not a single implementation of 3DTV, but rather several including side-by-side, interlace, every-other-frame, which has led to some interesting bugs affecting specific makes and models that fail to support these methods correctly.
I believe my first point is ultimately what has delayed widespread adoption of 3DTV tech and caused some to call it a "fad".