The great proliferation of Greek-speaking monasteries in America is of little benefit to the aspiring monastic who does not speak Greek. He (or she) cannot join one of these monasteries unless he is willing to learn a foreign language. This effectively limits the pool of future monastics in such monasteries to those people who know Greek. This is fine, but it does send the message that, "We want Greeks." Am I making a judgmental jump to this conclusion? Yes, probably so. But I don't think it's a terribly unreasonable jump: do any non-Greek speakers join monasteries which use only Greek in the services?
I can answer this one, and that is yes. I have known several non-Greek speaking people join Greek monasteries here in America. And, they do end up learning Greek.
There is also the issue of visitors who do not understand the language. I said more than once that these monasteries, with their facilities and so forth, make themselves particularly open to visitors.
Speaking for myself here, as a non-Greek speaking person, one of the main I reasons that I visit the Greek monasteries is to hear the services in Greek. I visited St. Anthony's for my nameday a few years ago. Now, I grew up in the GOA, so I can understand a tiny bit of Greek, mainly the liturgy. But a 5 hour vigil, I definitely cannot understand that. But I loved it. Byzantine chant is at its best in Greek. It just doesn't fit well into English because of the rules of the melodies, and the fact that they were written for Greek. Similar to what was mentioned in an earlier post on this thread with the anaphora in Slavonic. "Svyat" is one syllable, while "Holy" is obviosly two. The music has to be changed to fit the English words. This is the same with Byzantine chant.
Well, why is that important, you might ask? The monks at these monasteries that do the chanting, mainly only have the Byzantine notation in Greek. Now, Fr. Ephraim (not the elder) is working very hard to make English settings of Byzantine chant, but it is a very long project, and it will take many more years to do everything.
It is also important to note that many of the monks, especially Elder Ephraim, are not fluent in English.
But, again, for me, I would never want them to switch to English in the monasteries, since to me, they are little bits of Athos. I would feel the same in Jordanville. I have never been to a service there (I visited once in high school, but the monks were all in SF for the canonization of St. John), but I would love to go to hear the service in Slavonic sung by a monastic choir.
Just my thoughts.