What I do know is that predicting a downturn some 50% longer than the 1920s depression is at the bat**** crazy end of the pessimism spectrum.
There was no depression in the 20s. There was a short, sharp recession (about a year and a half long). This was followed by the “roaring 20s”, a period of massive growth and prosperity.
So how accurate and useful is your opinion when you don’t even know what you are talking about? Suggest you read up on what led to the great Depression in the 1930s and you will see a lot of parallels.