This is demonstrably false. Napster and it's ilk did hurt people. It did not focus it's upset only on the 'entrenched asymmetric power structures in the music industry,' it also affected small business and independent musicians, arguable more so, since they weren't as well funded to adapt to the disruption.
In terms of the 'crucial development leading to iTunes.. Spotify,' how have these not become the newly entrenched asymmetric power structures? Bandcamp is a notable exception, and I don't think Napster in anyway contributed to it's development, except for the fact that it might have been a way to distribute your own music. But that wasn't it's primary use.