To me, there will never be such a place called “Instanbul”; it will always be Constantinople. (As it will be to the rest of the world again.)
Constantinople is dead. If turkey is to fall, it’s capital, istanbul, will be the last stronghold...just as constantinople was for the byzantines.
It will be a thousand years before istanbul is not turkish. And then it will be something else, but never again will it be constantinople.