Precisely. LCD's have a completely different lifespan than Tube TV's, and people are just not replacing the cheap... huge LCD screens they bought with LED or Plasma. THere is just not enough of a difference to warrant it.
This is the same exact reason that PC sales are stagnate. There has been NO REASON for people to upgrade all of the Core2Duo's and such that have been sold for the last 5-6 years, because the software has become stagnate.
The "home PC' are dying" crowd is hilarious. People are just starting to really integrate them into HT systems, and soon whole-home PC's with attachable "screens" will become the norm. THe central unit is't going anywhere. The only thing that will be "dying" are the cutesy little tablets and such, once everyone gets over that fad and realizes that they can't do any real work on them.