Thanks everyone for your contributions to the subject, but so far I have not recieved any clear answer to why the bitcoin price would be affected by bitcoin futures trading (that will be settled in fiat).
Sure, the launch of bitcoin futures is good news to bitcoin, but I've seen journalists speculating in traders shorting bitcoin etc and what effect that would have on the bitcoin price.
Why would it have any effect at all?
Ok, so you don't understand why something that is being traded in fiat would have any effect in bitcoin themselves, right? I'm not an expert myself in futures but this guy did a pretty good analysis:
https://masterthecrypto.com/will-bitcoin-futures-affect-bitcoin-prices/It seems that, for example, for gold it didn't work too well short term but eventually was meaningless so you might be right. Bitcoin might not be affected at all by it. However because bitcoin is purely speculative right now, I'm sure it will drive the price even higher, hard to tell right now because it's already climbing hard anyways.