I don't think LCD or Plasma displays are dead yet, not by far. Really, I think all these new technologies are ultimately vying to fill three main criteria:
Flat
Thin
Cheap
Of course, you have to factor in picture quality(but I think that's always been a given), in which the advantage is currently on the side of LCD and Plasma. I'd say OLED displays are going to need a few more years to simmer before it becomes a viable alternative and fills all three criteria. But, i'm no expert. I'm just a casual observer.