Oh come on, kids have been watching TV, listening music and reading books for many generations.
You seem to assume that the problems in education have appeared from nowhere in the last few years.
Also, when I were a lad, at least in the UK, Kids TV had a lot more imaginative adventure serials, magazine shows about hobbies and current affairs and game shows where the contestants actually had to know or do stuff; and a lot less cheap cartoons designed explicitly to promote toys, thinly-disguised adverts for music and fashion accessories, mundane soap operas about dull people living dull lives, no-brain-required 'contests' and talent shows designed explicitly to raise money from premium-rate phone lines... all designed on the principle that anything requiring an attention span of more than 5 seconds will hit ratings. Seriously - modern kids television (insofar as it still exists) positively encourages goldfish-level attention spans. Hell, some programmes are flagged 'ADHD' in the listings!
(Boringly, 'ADHD' in the listings apparently means 'High Def' and 'Audio Description available'.)
As for the 'firing bad teachers' bit - the danger is that will only clear up a tiny percentage of teachers who are dramatically bad, while further re-enforcing the obsession with testing. If your job is on the line based on your test results, you're not going to skimp on the test cramming in order to do something creative or interesting.