I disagree with your evaluation of economics. Some of the more useful and interesting courses I took outside my major were three courses in economics.
Well, I am glad that you found those courses interesting and enjoyed them. I am not saying that we should scrap or phase out the discipline, however, I do believe that the way it is taught needs to be reformed. Much of what was taught when I attended school were unproven theories and when some of the unproven theories are actually implemented in the real world they often make things worse rather than better. Heck, even Paul Krugman (he won the Nobel prize in economics) recently stated that macroeconomics as a discipline is in worse shape nowadays then when he graduated from college.
...the secretary of the treasury isn't repeating the same mistakes of 1929-1932
Well, it is the academic professor and now Fed chairman Ben Bernanke who studied the Great Depression. Note: In a recent article that I read (in Forbes?) the author mentioned that Ben Bernanke publicly admitted that he does not understand why his policies are not working or why unemployment remains high. The fact of the matter is that the mistakes of say the Fed during the Great Depression are still being debated today. Also, the U.S. is a vastly different nation today than it was during that time period, so, what might have worked back then doesn't mean that it would work today.
Although congress is likely to consider a bill that look a lot like Smoot-Hawley.
Again, this tariff and its impact is still being debated today.
Theory vs. Practice (one specific example is being used)Among others, Henry Mintzberg has been stating for years that management is practice and that B-Schools do not equip managers to be able to manage. By itself, you can't learn cycling, swimming, singing, playing a musical instrument etc. from reading books or debating what the protagonist in a case study on cycling/swimming/singing etc. should do. You also can't learn an activity by listening to a cyclist, swimmer, singer, musician describe what they do. What happens in B-Schools is that the cyclist, swimmer, singer, musician is not even left alone to practice his/her art - instead they are forced to research, write and publish papers on - 'the ultimate rules that govern cycling/swimming/singing/playing the instrument'. If someone wants to argue that a person needs both theory and practical experience I wouldn't disagree.
Just to add some complexity to the discussion -- Learning is often "context specific"Just like in software development many of the things a manager working at ACME, Inc. needs to know (or should know) are not universally applicable to other businesses.