Should be people buy HD TV's and DVD's or stick with what they've got?

Obviously it will be a harder decission for people with a smaller income to upgrade and to keep up with technology, and there would be less hesitation for wealthier people.
Also satellite companies such as sky have introduced HD channels which require a separate subscription which would urge some people to upgrade.
Apart from a much better viewing, having the latest technology is a status symbol for some people, which is why they would keep up with technology.
Ultimately these developments are just new ways to squeeze more money out of us. Bluray disks are almost double the cost of a standard DVD so is it worth buying?
There is also a converance into home entertainment systems, such as playstion 3 and xbox 360. These consoles will be HD and bluray which would encourage people to buy one rather than a bluray player.