I would have him not view people on the other side as advisaries.
"Competitor that through their marketplace success makes us further from our social goal" doesn't have all the same connotations as "advisory", but given their goals I don't see how it's not an accurate descriptor.
No, the software marketplace isn't a zero sum game. I'm not even a believer in free software, but it still frustrates me to no end when someone says "not a zero sum game" in a conversation that is so obviously about market share.