Will they hold them or not sell them at once? This is the important point. No problem if it doesn't sell. But if they are all sold at once, then it can create an atmosphere of panic. But this panic does not last long. They will recover in a short time. So there is nothing to worry about in my opinion.
Everything in crypto is possible. Either they will sell them all at once or they will prefer hodling, there are always inevitable events in the market that create a huge negative impact and leave the market dumping. However, we should not panic in all these events as these things are not new here. Bitcoin has always a strong foundation, so whatever attacks that it may encounter, it will surely find its own way to survive and continue to stand firm. That is why there is no room for worrying, as it may lead to depression when things seem to be uncontrolled anymore.
People should not worry about something so small, if you do not know how much money moves daily in bitcoin that amount of money may seem to be very high, but when you see the volume of bitcoin and how many coins move each day you realize that the amount of coins that could be sold is nowhere near enough to make the market crash, at best we could see a small reduction in the price but that will be it, and in the case that we actually saw a crash it will have way more to do with people panicking due to the misinformation that they read rather than the amount of coins being sold.