Re: If bitcoin price is $10.000, will fiat be worthless?

Fiat will always be in demand and it won't care where bitcoin reaches in the future, people who are comfortable using fiat will use fiat only and not bitcoin.

but if bitcoin prices become very high. bitcoin will certainly become popular then many people would be interested in trying bitcoin I'm sure of it.
but I think as gold. bitcoin will still be commodities or payment option.
Fiat will remain worthwhile

If bitcoin prices will go high then also people will convert it to fiat to hold more amount of fiat which will take their buying power to a higher level.

Yeah fiat will always exist and people who don't have knowledge about bitcoin they will use fiat or credit card but they will never use bitcoin.

If they don't get any information about how much better Bitcoin can be for them, then indeed, it won't happen. Education is the key to getting the average joe to dump their worthless debit cards where they are only building up more and more debt.