Um, this is similar to saying: "Hopefully one day there will be many EO parishes in Ethiopia."
Well, last I checked EO was not the official religion of the United States.
So it's not exactly the same thing. Plus as Salpy pointed out, what of those OO people who cannot take Communion but for maybe once a year? I know there are special dispensations for such situations, but most priests of the Russian background likely would NOT commune an OO anyways....then you'd have to get Bishops involved, Church politics would come into the fray, and the poor OO person would be accused of some wrong doing, then the EO would be accused of wrong doing.....I've been Orthodox far to long to continue to wear my rose colored glasses, I know how something minor can get blown way out of proportion and before long there is some inter-parish, or inter-jurisdictional incident to deal with. Why bother with all that when having an actual parish for OO to attend would solve the problem?
When I used the term "mission" I most certainly didn't mean it in it's historic context, but rather the modern American context of "a Church just getting started which has Liturgy once a month" type of thing. There are tons of "mission" Churches in the lower 48 who are in no way trying to convert anyone...they're just there in remote places so EO don't have to travel 150 miles to commune. That's all I meant. I suppose "mission" is a poor choice of wording, but there are tons of "mission" parishes within 3 states of me, and not a single one of them is actually doing "mission" work of any kind. So I guess my context is slightly different than yours, and next time I'll be more clear.