According to my perspective none of the real holders of Bitcoin have lost so far. Those who get loss were not good holders.
There's low or zero risk to holding bitcoin over a long time, this is one of the real time high benefits investor derived from their investment on it, the longer it is the lower the risk, a food example to serve as prove is the record history on the volatility and price over previous years and how lot have make good opportunity out of it through their investment, quite alright we can assume that some has recorded losses as well due to wrong timing or inability to understand the trends in bitcoin and it price speculation which is as a result of their personal error.
We have seen the halving of Bitcoin in the last few days and hopefully if the market situation improves we will see the new ATH in the future as well.
This is of course certainly going to happen, before the next halving things might slightly change but after the halving then the price rises to make a new ATH over the previous.