Can't predict what's coming in the next few years. But it might be worse than 2008, maybe even 1929 because as the experts in the third video point the global economy is heading into uncharted waters with the systemic risks induced by negative rates and record high sovereign debt to GDP ratios. There's also the permanent downward projections on high paying real wages due to automation coupled with growing population.
Personally in the past several months I have begun to actively readjust how my money is invested, with the thesis that the market and global economy is going to go into different phase. My thinking has been similar to what was being discussed in your third video. I put a large chunk of my money (about 25% of my net worth) into a market neutral strategy. It's almost market neutral - it takes a very small directional bias, 10% net long or 10% net short while attempting to capture alpha on the movement of the spread itself. I still have a sizable portion of my money (about 30%) trading long-only which makes me uncomfortable. For my next research effort I feel I need to focus on designing some short-only systems to balance out my long-only money. The rest of my money is in active long/short timing strategies which I plan to keep trading as-is because it has no correlation to my long-only equity stuff (it trades currencies, commodities, long/short bonds, and long/short indexes).