The Ecumenical centre of Orthodoxy is where truth is, not in a city, and as regards political power, the Orthodox centre is where the most powerful Orthodox people is, i.e. in Russia.
If Russia comes to the point of forgetting her Byzantine origins, what Patriarchate in what Constantinople will be able to remind her of those origins? If Russia does not come to that point, then the Ecumenical Patriarchate, wherever its Seat might be, can become our spiritual centre to the degree that it participates in truth. If the Patriarchate cannot become our political centre in any case, then why all this persistence in staying at Constantinople?