Restoring an ancient tradition that fell into disuse not because of heresy but historical circumstance is no sin. I could point to St John, but if the argument is that he's wrong anyway, what's the point of discussion? Besides, in his relevant quotes to the Church of France, he was not talking to Easterners who would not listen, but Westerners who he advised to ignore attempts to dissuade them.
God bless you Father,
I wish to state clearly: I am not say that this is a sin or morally wrong, nor am I saying that there are no circumstances under which this would be a good idea. My point is that in the context of the contemporary situation of trying to reach converts from the West that this may not be the best avenue.
Likewise, in my opinion your argument that my ancient ancestors from my French roots were Orthodox is weak. Me trying to connect to roots removed from Orthodoxy by scores of generations just seems like a grasp at straws. I converted to Orthodoxy and in doing so I have agreed to follow Her in whatever traditions She passes to me; since the time of the Great Schism She has preserved Her faith in these Eastern Rites.
Is it possible to reconstruct the ancient Western Rites and preserve in them True Orthodoxy? Yes, for some that could work but for how many would it ultimately become a stumbling block? We have all agreed that these authentic Western Rites are foreign to nearly 100% of converts, as much so as the Divine Liturgies of Saints John and Basil. So, why try to do that given the circumstances? At least I can feel comfortable traveling to Suzdal or something like that to know that although I am separated by language and culture from these people, I can instantly recognize their worship as my own. I have a connection to these people who are suffering for True Orthodoxy in Russia each time I worship in unity with them.
Make no mistake, I am not Russian, nor am I trying to be or adopt their culture. But I do want to learn my faith from them; I want to follow their examples diligently. I want to worship as closely as I can to what they have preserved. I don't want to look at these people and say, "I like you faith, and although your church life is vibrant, I would rather return to a form that is foreign to you and me."
Again, I am not saying that this is wrong on some moral or ethical level, I just question the motives for insisting on something like this, and how it can bring about complete conversion for Westerners without the temptations of returning to their former heresies. Now, I can see that the argument could be made that this could in fact attract even more Westerners because it honors their past. So, how did that work out for ROCOR in France in the long-run?