“The only question is, what nussach will they daven? Nussach S’fard, or Nussach Ashkenaz?”
That’s rich! Why aren’t Nussach Ari (which is what chabad uses), Nussach Teiman, Nussach Morocco, etc. options?
And why can we not retain different styles of prayer anyway? I.e., instead of looking at them as all bad, why can’t we view the, as all good?
Also not sure why the Rav zt”l thinks that the default will be the Anshe Knesses original. One can argue that the Yemois Hamoshiach will be an Oilam where the Nistar becomes Nigleh and so that Ari revisions will be more appropriate for such a world.
In any case, some portions, i.e. Lamalshinim, will no longer be applicable. So we may switch to the original and redact that prayer, but not because anyone did anything wrong all this time.