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.