lets say usa dollar and all currencies will be highly devalued .....then how we know the btc value??
most traders use USDT so if something happens with usa dollar is my USDT Will be worthless over night?
I don't think that most BTC traders use usdt. Do you have any statistics to support that?
Most trades around the world are made with fiat money.
USDt can crash regardless of what the USD price will be. USDt is not 100% backed by usd. not even 90%. We don't even know how much they really have.