A lot of people were saying the same thing when the price was in the $10-20k range, and look where the price is now.
based on the evidence at the time, $10k was not a bad place to buy. it was 50% under the ATH and also the dumps had significantly reduced. not to mention the ridiculously strong buy support at $10k which took millions of dollars of dumps to break it when the time for it came.
not to mention that market being unpredictable, you sometimes need to take risks like that. if you are a trader then you simply accept your mistakes, sell at $9k and buy back lower making even more profit!
just as a reminder, the previous one lasted for two and a half years.
I think you may need to take a look at the charts. price drop began at the end of 2013 (December=$1100) and bottom (lowest price) was reached by the start of 2015 (January=$150) which means the actual bear market lasted a year. from then to mid 2015 (=320)was the accumulation and by July we already were at the beginning of a bull market when price reached its first 100% rise and traders took their gigantic profit out. by the end of 2015 price was already in $500 range.
in other words 2.5 years after the December 2013 bubble price is already in $770 range which is over
400% rise from the bottom of the bear market. so I don't really get how you concluded that "bear market" last time lasted 2.5 years" since you are off by 1.5 years!!!