Even Greenspan did not believe, that what he created can be that sustainable. Amazingly it is over 2 decades. And that is not short period.

Question is how the money has to find the way to markets. If things will be like now, it is rational to think that nothing will change. Money can go to markets if the super rich people and corporations would like to move from speculative markets to lower floors of more real economy. But I do not see why this should happen. There is no ROI, markets are saturated.