If time and date are unpredictable, what's the use? Suppose you switch to conservative investments now -- say, bonds. You're going to be hit less hard by the recession, but you also will have missed out on gains.
So, unless you believe you can time the market, it doesn't appear like there is much to do except to make sure you have a rainy day fund.
Your sentiments contribute to the bubble. It is possible to live without forking your money over to the stock market. It is harder to grow great wealth, but that is phony wealth at the moment or soon enough. If everyone invested in themselves, demanded a stable gold or gold backed currency, and eschewed the bubble gains in the markets, the gains would not be there and the manipulation would not be possible. That would reflect the reality of our current situation. Times will get tougher the longer we wait to see reality.
So, unless you believe you can time the market, it doesn't appear like there is much to do except to make sure you have a rainy day fund.
All my other money goes into the system.