There is something else that should be considered...prior to concluding whether coffee hour in needed or not
In countries where majority of population is Orthodox, Orthodoxy is present in all level of society.
Orthodox RE classes at school and in the church, celebration of St. (school patron in Serbia)
Pretty much every single organization (from sports teams to fire stations and cities) have their patron saints
Orthodox material at public libraries, lectures by Orthodox clergy and/or Orthodox topics
TV shows and documentaries about Orthodox topics, as well as media in general informs about all major feasts...I don't think
Anyway the point being is that Orthodoxy is present in everyday life in (let's say) Serbia, while that is not the case in countries where Orthodox people are minority. In such parishes coffee hour and other activities which could bring parishioners closer are very much needed. Parish in such places is not "just" a parish ;its actul name is "church-school congregation."
Leadership of each church-school congregation (priest, church council) is therefore responsible is providing an alternative in order to fill out the gap...that is why coffe hours, catechument classes, RE classes at parish for kids and adults, mini library, story time for kids, Serbian/Russian/Greek/etc classes for kids and adults should be offered as well...People need to be explained the significance of Orthodoxy for that one day a week they spend in the church and to be able to preserve their heritage. That won't make them worse citizens of a country in which they live. It is quite contrary.
I agree with the need to have a pan-Orthodox feeling, but by abolishing all other jurisdictions except the "American" ones is not the way to go due to the uniquness of a situation. Perhaps the best way of doing so is by encouraging parishioners of different juristictions which live in the same or neighbouring cities to once a year visit each other not individually but as a parish, to have summer camps for kids together and other similar events. Another thing I want omention is that non-English speaking countries should have a Liturgy and an evening prayer done in English once a month. Reverse rule should apply for the English speaking parishes (one month, Slavonic, Greek, Serbian, Russian, Romanian, etc)...Anyway those are my two cents.