And substituted underproduced trash. It didn't stop the overproduced crap either, as can be seen by listening to anything by any random pop diva or boi band since.
As for boy bands etc., backlashes happen. The bands I'm talking about had all (except for one) been long broken up by that point and yet the industry was still riding on their coattails - I guess this left a huge unexploited gap for 9-12 year old girls, but it doesn't prove that those bands were anything less than brilliant or revolutionary.