Between weird investment strategies, the length of the current boom, and the very low interest rates at the peak of the boom, this coming bust is going to be a massacre. I'm honestly not even sure whether the system as a whole will survive it.
This works as long as there are enough non-index investors trying to outsmart the market by actively trading.
The question then remains the same while changing. Do I invest in the market, or in canned goods?
But although you might get better returns picking the next strategy, you probably would do fine with index funds.
And timing the market has always been a loser strategy (except for a few lucky or skilled outliers).