Dear Fr. Peter,
As ever, you offer us much food for thought - and very nourishing food too.
Perspective is required on numbers, as Fr. Simon's post shows. Indeed, once upon a time most of the Church could fit into an upper room in Jerusalem, and some members of that were quick to pretend they knew nothing of it when circumstances changed. It is here, perhaps, were we recall that comment on the essays you review in the GR about Chalcedon - that St. Dioscorus was the Athanasius of his day. And he's a reminder that the earthly fate is not always that of St. Athanasius. All we can do is the Lord's work; He it is who brings the increase.
You make some extremely interesting observations which go far to address some of Fr. Gregory's comments.
I would share the view you express about the lectionary. Whilst I was to attend Church my Catholic friend very 'kindly' lent me three volumes of the Catholic lectionary. Of course, he was rather hoping this would help me to see why he thinks everyone should be a Catholic, but its real use to me was to give me a structure for my Bible reading which I found very helpful as part of my spiritual life. I'd like to be offer him something of ours!
I have offered Fr. Simon my services to provide a catena from the Fathers for each week's Gospel reading, and he kindly sent me copies of the forthcoming Gospel readings - and not being familiar enough with the Coptic Calendar, I had to ask him to explain which ones came when! certainly the readings from the Synaxarium are interesting to those of us with an interest in Coptic history, but they are sometimes a bit gruesome, and the sort of thing you mention sounds most useful Your own Daily Life has been, and remains, a great help.
On the music, that's an interesting thought; it would be good to hear more about this.
On length I didn't read it as a concession to modern business, but more as an attempt to remind us that Orthodox tradition has in it, as you remind us, other liturgical forms. You raise some really interesting questions for further contemplation.
In this is love, not that we loved God, but that He loved us and sent His Son to be the propitiation for our sins. (1 John 4:10)