2013: WIndows 7 / Windows 8 / Linux / Android
1981: Atari 2600
2013: Xbox / PS3 / PS-Vita / Nintendo DS / PC
To compare TV of today with TV of 30 years ago and find them comparable is saying something!
The "main" channels basically got lazy and have failed to respond to advances in technology. Advances which have given the public so many things to do of an evening, even in winter.
The idea that any old rubbish can be put out and people will watch has been proven to be incorrect, as the ratings show.