I think it is total garbage the way people blame TV on curtailing the development of children. It is not TV doing that, it is the lack of input from the parents who plonk them in front of it for hours and hours.
Watching a 15 minute episode of something like Thomas the Tank engine is not going to damage a toddlers's brain cells and if anything, they will use their imagination to make up stories. At the moment, DTS (3yo) claim that our car is a train, that they are passengers and when we stop at the traffic lights, we have to pick up more passengers.
As for TV being rubbish in general, well it depends on your interest doesn't it? The programmes I tune into at the moment include History of Britain with Andrew Marr, The Seven Ages of Rock, The Apprentice when it was on, Law & Order, CSI, Grand Designs, Late Night Review, The Sky at night as well as interesting documentaries and nature programmes.
I select my programmes to match my interest and don't bother with the rest. I also read voraciously, exercise including running, I'm learning German plus cook and bake. DTS can name all the planets in the solar system and are endeavouring to count to 50.
TV is not the cause of ills in our society, it's people and their attitudes and imho, too many people use TV as the whipping boy because that is the easy option.