No longer about quality.
It's all about cost. Consumers have been lead to believe TFT sets look as good as plasma, by manufacturers keen so sell the much cheaper to produce TFT sets.
Shame, they don't know what they are missing. I have yet to see a TFT that can even remotely come close to the quality of even a middle or the range Panasonic plasma, let alone a high end Pioneer. Even a 720p Plasma will easilly outperform a 1080p TFT.