Don't hear what they say. Because there is nothing sure, only predictions. Even if Bitcoin decreases by $2,500, take it as an opportunity to buy not think that it will be the end. This technology may have too many critics but they know the fact that Bitcoin and the blockchain technology will be beneficial to our future.
They have the experience and expertise so what they are saying might be true. Bitcoin is volatile so the probability is not that 100%. I think with proper analysis of the experts they can study and predict what is about to come to bitcoin. What can happen does not depend on their analysis but I think it has the edge to know and assure what is about to happen.