Computer power is everything
When such things has HD are invented it has a domino effect on all the hardware that needs to support it. For example the Edinburgh Party Bus has had a new laptop installed and when they cam to play a video through it using HD format, the laptop almost gave up the ghost.
So its fine and dandy to invent and improve all these types of medium, however then downside of it is you have to upgrade or replace all your hardware to cope with the new demands.
So remember when buying a PC or laptop, you will need to buy another one no doubt in a few years just to keep up with the new developments.