My crystal ball is in the attic as we still have our Christmas decorations around the house, but I will offer my thoughts. I suspect that as time goes by those who are Orthodox here in America and Canada will develop their own adaptations of Chant. All of the Chant traditions used across the Orthodox world can be traced by musicologists to the Byzantine Chant. I know from my study of Carpathian chant that it derived over time from local adaptations of existing chant. I will excerpt some of an interesting article on the chant from the Carpatho-Rusyn Society's web page as I believe it illustrates the process of what will likely occur over time through organic development of a North American chant style."The roots of the Carpatho-Rusyn Plain chant reach down to the Byzantine liturgical music arranged by St. John Damascene (d. 749) according to the scale of eight tones (Ruth.: hlas --voice, tone) that were in use by the Greeks in the eighth century. There are some liturgical hymns or canticles that could not be fitted into the musical system of these eight tones (Greek: ektoechos-eight tones). The melody of these special hymns repeatedly changed and many of their melodies were preserved. Thus, for example, we have twenty various melodies for the Cherubic Hymn registered by Rev. John Bokshay in his Tserkovnoie Prostopinije (1906). And the number of some melodies can still be increased.
This was not the case, however, with the hymns which were controlled by the eight tones system. Their music was more stable and, even after some changes during the centuries of its use, they retained characteristic elements of the original melody. These original elements must be discovered by the musicologists as they try to present to us the history of the liturgical chant.
Contemporary scholars, studying the Carpatho- Rusyn liturgical chant, are able to trace its origin from Kiev to the Carpathian region. Thus, in the formation of the Carpatho-Rusyn liturgical music we can discover three distinct layers of composition that, in the course of centuries considerably modified the original Byzantine chant, namely: 1) Bulgarian-which developed along the lines of Cyrillo-Methodian tradition; 2) Old Kievan-as was cultivated in the famous eleventh century Monastery of Caves ("Kievo- Pecherska Lavra"); 3) proper Carpathian- through the influence of some popular melodies, characterized by the chromatic scale.
As was mentioned before, Carpatho-Rusyn liturgical singing is monodic chant (Greek: monoidia-singing alone) executed in unison. Of course, a group of people of various sexes and ages could never sing in strict unison. For this reason one can always catch some fragment of folk harmonization in the Rusyn churches. It might be informal or even unconscious, but it certainly adds to the "mystical power" of congregational singing.
In the Carpathian region liturgical as well as folk music was transmitted from one generation to another by means of oral tradition. At the very beginning there were no books containing music available. When they did become available, neither the cantors nor the faithful had sufficient musical education to be able to read first the neumatic (set of signs) and, later, the square or diamond notation. The monastic schools of that period provided qualified candidates with only a practical training in the liturgical chant." http://www.carpatho-rusyn.org/spirit/chant.htm
AS one learns the complexities of the entire Carpathian chant cycle, assuming the student has at least a basic introduction to other chant systems such as Byzantine and Kievan, you can hear the influences of the prior chants. This is true in particular in some of the eight tones of the Matins and special tones used on special feasts.
In that Appalachian folk music is indigenous to North America it is logical that its familiarity may indeed weave itself into a new North American Chant, but it is equally possible that influences of Latino, Blues, Pop and, yes - even Rock - may do so as well. We shall just have to wait and see as I don't think such a system can just be invented or created at will.
To many of us, this is the beauty and the power of the North American cultural melting pot as its best. We shall have to wait and see.