I wont but the problem with those people that only come to bitcoin for the price is they will switch immediately to any other coin that promises them the possibility of earning bigger amounts of money in the shortest time frame possible, they are not in bitcoin in the long term.
Just let it that way and I don't see majority of all bitcoin users are like that.
Also it's not wrong to get some opportunities to earn in other alt since traders always like that and even happening in physical assets of trades even prior to the existence of cryptocurrency. And to add for that, there is low chance that all whales and bitcoin bagholders (I said ALL meaning 100%) will goes into diversifying tactics just to earn side income with other alts.
I don't even know if people will be more excited to hold and use bitcoin or just scare because of the giant price.
$10,000 is soundslike delusional , but i believe nothing impossible so let's say it will happened in the future.
fiat should have no problem at all as i think people will still need it .