Mainstream music, sure, but there will always be bands like The Flaming Lips, or My Bloody Valentine releasing records that are completely counter to this approach.
I would argue that any 'true artist' - aka one that is consumed with the perfection of their art - is not going to be swayed to produce a 'hit' no matter what the studio wants (they simply won't sign with a big label to begin with, I know plenty of musicians that feel this way and are happy on an indie label).
I see what you mean now. Although "don't like music" is not the same as "aren't into music". This goes back to the definition of what "real" music is. I'm fairly certain suburban moms (one of the suggested demographics in the article) will know quite a lot about radio-friendly music through their kids. In that sense they are an ideal demographic. I also don't see a problem with testing the hooks of songs against the market before making a substantial effort in promoting those songs -- that's common sense.
I would argue that any 'true artist' - aka one that is consumed with the perfection of their art - is not going to be swayed to produce a 'hit' no matter what the studio wants (they simply won't sign with a big label to begin with, I know plenty of musicians that feel this way and are happy on an indie label).