If we have something to thank Van Zanten for, it was the catalyst that started the CRM ball rolling. Of course in some Asian carriers the FO would still let the ac run into the ground.. but that's another story.
In Western culture, it is expected that any decision that the FO is unhappy with would be challenged overtly.
None of this "isn't that the ground commander?" (as said by one 727 FO who failed to initiate action before a CFIT)
I don't think this thread serves any purpose (perhaps 20 years ago) as in a Multi Crew environment in the 21st century most if not all the younger FO would I like to think be assertive enough to challenge any potential issue.
Eventually all Multi Crew pilots will have gone through CRM, and the old pre CRM dinosaurs will have retired. I think that in itself will reap major safety benefits.