But the clue, I think, is in your last phrase...
Changed the world for those kids, I'd agree, but not 'changed the World'. A major effect on those that 'were there', but much less important (as a TV show...) for most of the planet; even less so for those who'd already been exposed to them and their peers. I remember their first passages on the Light Programme (we had no TV at that time...), and was well aware of the hysteria surrounding their every appearance, but to say it was like St Paul's epiphany would be a great exaggeration. There were many other groups around at the time that also caught our attention. A greater impact was the passage of John Peel on the airwaves to many in the UK, and possibly Europe. I'm wary, in any case of fanaticism in any form.