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Oh you mean Ultra HD? Yeah that's happening. But why would Apple be at the forefront of that? They've never been big on offering the best quality media.
 
Because it's a hobby, just like the Apple TV.

When people buy a new TV, it's because their current one died on them, or they don't want to carry it with them when they move or something. There are people who are into buying massive TVs every year, but very, very, very few. It's too small of a niche market that wouldn't make the production cost worth it.

You're not sitting a chair away from the TV either, so Retina isn't going to make a difference. The panels on the regular MacBook Pro (with an update) make more sense.
 
TV's just don't make money anymore. Everyone (except me) has got a LED HDTV now, so barely anyone is buying. Here in New Zealand they're slashing the prices right down so you can get a pretty damn good TV for only $600. If Apple brings one out now the price would be more like $6000...
 
TV is actually a shrinking market. Apple prefers to jump on things too early rather than too late.

People will always want a large screen in their living room. The general source of media for that screen may change, but demand for it will not.

Though at the same time, as Jessica points out, people don't replace their TVs as often as other devices.
 
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