your friend is also just doing speculation. it would be great if he gave you a reference as to why the bitcoin price could go that high by the end of the year.
Yes, it is purely speculation. And I think it is no need for a reference because it cannot help much. We all know that no one can guarantee the price of Bitcoin to achieve $100k, it is something impossible. I am not sure if every statement of big players or experienced traders, can be trusted. Those people who speculate Bitcoin to reach $100k, may just try to make people not exit or take profits too early.
Everyone can speculate on their own and since no one can predict the Bitcoin price, all we have to do is to speculate the possible price in the future.
They are just holders who believe that the Bitcoin price will reach $100k and there's nothing wrong with it, it's a sign of courage to them to keep hold their Bitcoin and not to sell at an early stage where the purchase.
IMO, Bitcoin will not reach a $100k price in this last quarter of the year, it's too early for that. However, I have doubt that this year the previous ATH will break and surpass the newest one. We're in $57k and a little more to go to become a $60k plus which is the previous ATH.