The reason why people will predict the bitcoin prices in the next 5 to 10 years is because whatever bitcoin price they expect, there would be no one to challenge them. Most people will forget their price predictions and hence they won't be held accountable.
If anyone is so genius to predict the bitcoin price, why not tell us what will be the bitcoin price at the end of August 2025 or the end of this year? To be honest, it is real hard for anyone to guess the price and that becomes the actual price of bitcoin. Making random guess can be done by everyone
Another reason that comes to mind is that making such far-fetched predictions could be to satisfy their imagination, and because as you say, no one can refute them and they won't be held accountable for what they say.
That could also be why most of the predictions about bitcoin in the next 5-10 years are somewhat exaggerated and unrealistic when many people think that bitcoin could increase 10x or reach $1M in the next 10 years, but no one could provide any data or analysis for their predictions.