This was said about the iPod, iPhone, and iPad as well. People aren't going to want to spend the money. Yes, this is considerably more money, but it's also a larger device. I'm willing to bet that people WILL buy an Apple designed television. And I'm willing to bet that once it's unveiled, I will be looking for ways to accidentally knock my HDTV off the entertainment center so that I can tell my wife we need a new TV.
There's a HUGE difference. People that have iPods, iphones, iPads, the overwhelming majority did not own a similar device before they purchased them.
How many people owned actual MP3 players before their first iPod?
How many people owned an actual smart phone before the first iPhone?
How many people owned a real tablet before the iPad?
Very, very few. That's why iMac and Macbook numbers are so insanely low compared to iPhones and iPads.
And finally, the biggest reason you will not see the same success with a $2K Apple branded TV as you have with handheld devices:
People can't parade around with them in public to show off.
Apple products are, to an extent, fashion accessories. A lot of people buy them because it's the cool/hip thing to own. If they can't go downtown and show the world they own the newest iPhone, what's the point?