Most people shrug off the predictions of experts because they know that that bitcoin is unpredictable and we are all the same. No one can know what will happen and predictions are just predictions, it will happen or it won't happen.
Like those experts or anyone who makes predictions that bitcoin will hit $1 million by 2030, do they have any credible evidence or data? Or are they just making random predictions? So there is no reason to believe in predictions that have no guarantees and anyone can make similar predictions.

I think people who like to believe experts' predictions are because they always make high price predictions and as investors, everyone wants that to happen. But for realists, such predictions are meaningless and experts only attract the attention of the crowd by saying things that the crowd wants to hear.