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Yes, that happened in the early 1800's. But the interesting thing about this example of conventional wisdom isn't what the people of the 15th century believed, but rather what the average person of today believes the average person of the 15th century believed.
In other words, most people today believe that most people in Columbus's day thought the earth was flat. "Enlightened" people know better, but enlightened people aren't the masses. By definition conventional wisdom IS the masses.
Point here is that following the conventional financial wisdom of maxing 401's, buying 30-year term, hanging your hat on ONE blue-chip stock, etc will not produce the desired outcome. If you want a different outcome than the masses, you have to do different than the masses.
You changed who the "enlightened" are to try to save your incorrect historical point. They actually didn't know better on that issue. They just tried to make themselves sound more enlightened by mischaracterizing others as ignorant "flat earthers."
Now that I think of it, this isn't as off topic as I first thought...