When bitcoin rise in price, people who are waiting for a drop miss out, whereas people who are planning on selling earns more.
It's pretty neutral. There are winners and losers in whatever direction bitcoin goes.
That is the exact reason on why one should plan their investments and decide whether to take the loss or the profit.
Same concept in stocks, if you purchase some stocks in a company, you should already plan on which price you would sell those stocks before its price plummets down. Another example, in the last quarter of 2019 the price of bitcoin reached an ATH of $20,000 but a few weeks on its price decreased significantly to around $10,000.
If you really do plan on long-term investment, then BTC is the way to go but you must be ready of the consequences (such as this scenario).