This guy has been giving series of bad advice. All his predictions fail, why do people still follow him? Is it some kind of blind loyalty to old school tradition? I wonder if he has changed his tune now. Warren Buffet seems to have similar thinking to Paul Krugman, he believes bitcoin is a scam and isn’t worth investing a penny in. True, he is a self made billionaire and a renowned for investment success, but that doesn’t make him an expert on all things.
In my opinion, the reason why they failed their predictions or innovative thinking is the same as why we consider them old fashioned. You are correct that just because they are successful in their areas of expertise does not mean they are experts on everything. New comers will eventually replace the old schools and history moves forward. All that matters is where we stand and how we react to all differences.