I can see what Evertt means and I have an example

Evanescence

Their first CD was AMAZING.

When their two main writers left the band after the debut CD (Ben Moody and Dave Hodges) it left an amateur songwriter Amy Lee to write most of the songs and they basically fell off the map after that. After that Moody and Hodges began writing with other artists including country. I mean their 2nd album was so bad.
It was a huge fall from the first.

But music will never die and I have no probs with artists writing their own songs. I prefer it that way anyway.