It's not just the loss of The Falls Church and Truro but the loss of all the other churches spawned by these two, including Church of the Apostles in Fairfax. (My family attends this church, and we are voting members of the congregation.)
Apostles has $1.5 million in pledges and plate support, although this number has been steadily dropping (as has the attendance and membership) since the General Convention in 2003.
I am sorry to hear this -- and that an effective counter could not have been formed (but even entire dioceses, such as San Joaquin, are finding themselves beleaguered).
Just FYI, my wife and I, cradle Episcopalians, left ECUSA for the APCK back in 1983 after we landed in an (even then) apostate diocese.