>>>>Can't see the need to change!!!
To briefly explain why.
Years ago the world was analogue (radio, phones, photographs, TV, cinema film, records such as single/albums and so on).
Analogue has all sorts of problem (pictures fade, LPs get scratched, phone signals fade over long distances, cinema film fades etc).
Then with the advent of computers everything was held DIGITALLY.
I wont bother to explain why but digital information cant fade over time, it will always be the same as the day it was created.
So gradually we are moving to a digital world.
Misic and films (CDs and DVDs ) are now digital, nearly all cameras (still and video) are now digital, phones are digital, Sky TV signals are sent out digital, feature films are often filmed digitally, radio can now be digial (DAB radio), even newspapers and books are created digitally.
Once information is held digitally it is much easier to store it, move it around, copy it and so on. And it can NEVER fade over time.
The move to digital TV is just one part of a huge process that has been going on for the last 10 or 20 years to get all the worlds information held digitally.
Digital TV has many other advantages over analogue, one being the "red button" where you can get all sorts of extra information about a TV program than is just being shown on your TV.
For example during Wimbledon tennis recently you were able to press the red button and choose the tennis match you wanted to watch, rather than the single match that was on BBC1.
There are all sorts of other advantages for digital TV ver analogue.
Once you have moved to digital TV I think you will find analouge TV very old fashioned.