1) Cost of 3D Tv versus 3D monitors makes ultra high spec silent PC's with large 3D monitors TV cards remote controls and blu-ray players ultimately cheaper than a 3DTV and a next gen console. Currently this is cheaper than a 3D TV by itself lols. Making a PC the obvious choice for a home entertainment system.
2) Consoles get delayed while MS and Sony wait for consumers to adopt 3D and it doesn't happen fast enough due to the cost. PC marker grows into the void.