I will argue that yes we have. The fact is, regardless of the disruptive nature of any invention, markets eventually run ahead of reality, greed kicks in and then comes the dip. Bubble are arguably healthy for the ecosystem as it eliminate the "dump money" looking to get rich quick. They also create Technical entry points for long term investor. But how do we know when a market has bottom?
History has shown that most market crashes are likely to bottom at 75% dip on just below. Stock market traders use market sentiment charts to measure this. For stock trading, when the market sentiment index scale(0-100) reaches or drops below 25, it indicates a buy signal. Looking at the BTCUSD chart, price fall from all time high to $5000 or slightly below indicate a dip of 75% which shows we are left with 25%. Cryptocurrencies are a highly volatile asset class and thus, its very difficult to pin point the exact momentum to which the price will reverse. This for what it is, will serve as a technical point for a major reversal together with fundamentals at the given time.