Found this : at http://www.pcmag.com/article2/0,1759,1745930,00.asp

That's what John C. Dvorak has concluded. He doesn't base his conclusions on market-share numbers, but instead via an intriguing online stat: how much Internet activity is Mac-based. And the answer is a miniscule and declining amount. John has laid out three reasons for the impending doom, and then adds a zinger: that the Mac's vaunted ease of use is what will slay it in the end. Read his thought-provoking column about why the Macintosh will fade away. And then complain to him, not to me!
I fear that there is truth in his rumblings.

Simply put, the ease-of-use and simplicity of the platform is killing it, because people cannot perceive that simplicity is ever worth MORE than complexity. Simpler should be cheaper.