If those who have bought in the last month or two and now have profited with BOOM, then it is better to sell now because take profit from the start is always better than having to wait long for higher profits because it is still not sure to come on BOOM.
In crypto or any trading market there nothing is clear, you sell one day and price goes to moon and vice verse. I do agree with your point that those who are struck in BOOM might have to wait for longer period of time now to exit this. Bitcoin is fully bearish now and as long as bitcoin is bearish there are no chances of BOOM getting bullish.