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No one knows when this all can happen, you know the market condition now a days is very high on volatility unlike before so there is no one can answers this question people are just speculating they are also always looking for update but no one can really point out when will be the next bull or bear.
What you said is very right because if those two things can be known accurately by everyone who often trades, of course everyone will often profit and always be far from loss when in the market in any condition. So when we often see some people who lose and some others are making a profit, it is a very common thing because in trading it is like that so everyone must have powerful knowledge and strategies to be able to profit more often than lose. And that is why everyone is still studying the previous trends that have occurred in the market to be able to draw conclusions for themselves when they want to trade again in a different trend.