Because they’re done.  As in Panasonic is done making them.

After fifty five years of making televisions involving tubes, Panasonic is now selling all its interest in CRT-based ventures to focus solely on flat panel models.

Frankly, this is a move that was a long time coming and, in a way, I’m almost surprised it took this long.  LCD TV prices are falling with every passing day.  It’s now entirely possible to get a 1080p thirty two inch LCD for under five hundred bucks.  CRT-based televisions no longer offer the significant cost advantages of their predecessors, and they’re much harder to move and transport, making them a tough prospect for just about anyone even considering buying a new TV to think of.

Why buy a tube TV when LCD sets cost about as much and look so much better?  There’ s just no sense in it!  And that’s exactly the conclusion Panasonic reached.