Ooh, this should be a fun mental exercise. Here goes my brilliant plan.
Step One: Sit down with a map of the U.S. and carve it up into a number of mission areas, which will then be assigned to current bishops as solely their responsibility, regardless of jurisdiction. All new missions, parishes, and monasteries founded in that mission area, regardless of ethnic or jurisdictional background, will fall under the omophor of that hierarch. For example, if Texas were assigned to Archbishop DMITRI and a new Arabic-speaking parish was founded, it would be under his care. Similarly, if a GOA parish split in order to found a new mission, the mother parish would remain GOA (for the time being) while the new mission would be under Archbishop DMITRI. This starts getting bishops used to a wide variety of jurisdictional backgrounds in the same diocese without immediately carving up the old ones. It also gets parishes used to having multiple backgrounds in the same area while under the same bishop. Finally, it starts the process of consolidating administration along geographic lines.
Step Two: Begin a master plan of the boundaries of the diocese of the united jurisdiction, along with tentative plans for who the bishops will be. To the extent possible, keep both very close to the mission areas set forth above.
Step Three: Consolidate the various jurisdictional departments under SCOBA. For example, shift from individual evangelism departments in the jurisdictions to a single one operating under SCOBA. Discontinue the old ones so that there's not a parallel SCOBA/jurisdictional structure going on. Do this with every department possible.
Step Four: Begin the legal work to establish the American Orthodox Church (or the Church of America, or whatever it gets called) as the legal successor to all the prior jurisdictions (sort of like a corporate merger).
Step Five: Finally, do the actual final consolidation, including the dissolution of the prior jurisdictions, assignment of bishops to new, smaller, more numerous dioceses, etc. Cap it off with a week-long media blitz covering the massive celebrations in the new dioceses over the formation of the (administratively) united Church in America. Conclude with the first meeting of the Synod of America.
Granted, that wouldn't be an overnight process, but it should be a planned out and deliberate one. American Orthodoxy won't look WASPish (at least not across the board) or like any other single background; instead, each diocese and the American Church as a whole will look like a mosaic at first. Over time, movement between parishes, etc., will create some "bleed" where Serbian customs seep into Greek parishes and Lebanese practices influence convert missions and so forth. You'll be able to see, in every single diocese
, our Orthodox heritage from elsewhere blended togther in a unique American local church.