You're forgetting a small historical matter: the Bolshevik Revolution.
The administration of the Russian Orthodox Greek Catholic Metropolia essentially fell apart with the elimination of the Church of Russia's financial support in March, 1917. Assuming eventual restoration of the Romanov Dynasty--and the Russian state church, Archbishop Alexandr mortgaged church properties to survive, but soon thereafter, due to law suites from the vile aberration of a church, the "Living Church," encouraged parishes to separate themselves from the Metropolia's direct administrative authority, while maintaining a spiritual connection. And don't forget the Church of Russia anathematized the Metropolia somewhat later, although most of the American jurisdictions ignored the actions of the Soviet Communist controlled church, maintaining relations with the Metropolia, but it was in no position to administer itself, let alone the church of America. It took the Metropolia 30 years to even get its parishes to agree to operating statutes, given the distance their parishes felt they needed to maintain from their Central Church Administration. And let's not ignore the proliferation of Russian jurisdictions, the Metropolia, the Patriarchal Church, and ROCOR---none of which shared communion (maybe except ROCOR, on and off); and later the Carpatho-Russian diocese. Then there was the problem of the Ukrainian jurisdictions and their attitude toward the Russian-American jurisdictions. When discussing matters of pan-Orthodox concerns among the American ecclesial jurisdictions, like the need for an American seminary in the mid-1930's, and the Russian-American people, who numerically were a significant presence, the discussion would stumble upon the question, "Which Russians?" Those churches remain distinct administratively even today, while communion has been restored.
Proposing an anathema upon the venerable "First Throne" of the Holy Orthodox Church, the Ecumenical Patriarchate of Constantinople, the see of Orthodoxy's "First Among Equals," is uninformed and wholly irresponsible, and unnecessarily provocative, not to mention utterly unproductive. No responsible advocate for the preeminence of the Orthodox Church in America's claim to autocephaly would ever desire such an action.