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Almost every time there's a debate about getting rid of the monarchy, people will say: "but who would be president?"
It's a strange question. The answer is obvious: "who we choose".
We can't possibly give names, because we don't know who will be potential candidates at the time, and the best we could do is guess at possible first presidents. After that no-one has any idea who our presidents will be.
But that's ok. Because we do know it'll be who the country votes for.