Never ? Unlikely. But as long as I can buy bitcoin for my trust and ownr wallets or any others and sell crypto for earning-everything suits me.
as long as there is crypto asset trading then it will be impossible for bitcoin to disappear.
because until now we know how the power of bitcoin in the crypto market. replace or eliminate it from the crypto market is certainly something impossible.
I think bitcoin is like USD in the world bank market which is used as a measure of value for other currencies.
It serves as benchmark of this entire crypto market, your comparison is true, something like USD from forex or stock market.
Being used mostly for pairing either you are long or short term trader.
Bitcoin will continue to rise and will keep his position while popularity continue to increase.