> 1-chip DLPs had that problem; the 3-chip that didn't use a mechanical color wheel > displayed a stable image. But it turns out people valued wall-hanging over picture > quality so LED "won".
I think cost played a part also. But it also never achieved enough success for people to want one, while the average person knew about LCD and Plasma TV's. I can't remember seeing a DLP TV in a shop, so I think retail had a hand in that.