"The easiest thing to do in these situations is to do nothing," he said. "But to do nothing will give you mediocrity.
"We need to set high standards and then make sure we stick to them.
"Everyone wants to win a World Cup but it's the behaviours that will get you there; you have to concentrate on the behaviours."
All bar second-string prop Ryan will miss Sunday morning's test (NZT) at Murrayfield..
Ryan will sit out the final match on tour, against Wales, so the Wallabies can supply a proper bench against the Scots.
It also means McKenzie must be creative in his three-quarter line selections, with Ashley-Cooper and Cummins out and red-carded outside centre Tevita Kuridrani facing a likely judicial suspension for his tip tackle on Irish flanker Peter O'Mahony.
McKenzie labelled the episode a massive distraction but said setting high standards and ensuring a strong culture was crucial to turning around a team that has dropped to No 4 on the world rankings.
"It's the glue that actually binds a team together," he said. "It's what is going to make a difference.
"Every team I have been involved with before, if you can manage a team culture and get a strength in that area it can give you the advantage you need to be a championship side."
- AAP