I've tried very informal related experiments - often in dealing with people it's necessary to challenge their assumptions about the world.

a) People's assumptions often seem to be somewhat subconscious, so there's significant effort to extract the assumptions they're making.

b) These assumptions seem to be very core to people's thinking and they're extremely resistant to being challenged on them.

My guess is that trying to change people's methods of thinking would be even more difficult than this.

EDIT: The first version of this I post talked more about challenging people's methods, I thought about this more and realised it was more assumptions, but didn't correctly edit everything to fit that. Now corrected.