Some people simply make their predictions without any specific reason. Cannot always trust the words of crypto experts which is why I feel that our own research and predictions are what matter at the end of the day. John Mcafee has been making some pretty optimistic predictions about bitcoin in recent times and I do agree with him in some ways. I do feel that bitcoin has the potential to touch 100k in the next 2 years, but 500k is way too optimistic.