Dominaria is a nexus between a large number of planes. That's why older planeswalkers came through there often, it's one reason why the Phyrexians invaded the plane, and why the first stories where centered there. But the single origin it is not. It may not even be the oldest plane, if that concept even makes sense.
I believe in the novel Planeswalker (set shortly after the events of The Brother's War which took place on Dominaria) Urza manages to travel to the plane of Equilor, a plane that had lost most of its vestiges of mana due to the long age of the plane resulting in Urza and Xantcha being trapped there for many years while Urza figured out how to Planeswalk away. So just some food for thought on that subject.
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I believe in the novel Planeswalker (set shortly after the events of The Brother's War which took place on Dominaria) Urza manages to travel to the plane of Equilor, a plane that had lost most of its vestiges of mana due to the long age of the plane resulting in Urza and Xantcha being trapped there for many years while Urza figured out how to Planeswalk away. So just some food for thought on that subject.