I do somewhat agree with Tom. I really don't want a big, ugly (even big plasmas are ugly) TV floating around my living room. I do want a big TV though (I am a guy after all), but I want it in a den/basement area, out of the way, with the rest of my home theater stuff. In my living room, I'd be happy with a small 27-32" TV, tucked away somewhere with no receiver or anything. I mean, when most of us simply watch network TV, why do you need 62" televisions with surround sound?
Tom, usually I'm on your side, but seriously, no one WANTS a 19-inch TV.
Some people might want a nice little white flat-panel as a stylish accessory for their kitchen or bedroom, but if price were not an object, everyone would be getting 42-inch flat-panel HD sets for their living rooms.
Unfortunately, as Molly pointed out, the high price is the substantial barrier to entry, but once that comes down, then you'll definitely start seeing events like the World Cup, the NFL season, and Steven Seagal DVD releases making a significant impact on sales of HDTVs.
Listen to the ladies on this one, it's America, everyone wants the Super Size!
P.S. As for your ''small apartment'' theory, I can see how some cramped renters might THINK that a 37 or 42-inch flat-panel would be too big, but in reality, I have one in my 600 sq. ft. apartment in SF, and the footprint is smaller than the 25-inch CRT behemoth (circa 1987) that it replaced.