I hate to publically reveal my ignorance and spiritual ennui, but I'm not in the least concerned about unity with Lutheranism nor the Orthodox expression of Christianity -- in light of the disunity and schismatic state of Roman Catholicism.  The RCC has lost MILLIONS of members over the past 50 years as it has struggled with the disappearance of fear as reason to follow faithfully, the horror wrought by child sexual abuse and evils of rampant clericalism, the continuation of gross misogyny, and unchristian actions against LGBT brothers and sisters, plus remaining at least 500 years out of date in the realms of science and human development.  Those reforms would be much more meaningful to many remaining Catholics than would ecumenism -- which should be a given since we all (pretend to) follow Jesus anyway.  Maybe we should put our own house in order before seeking to extend power and control over others' particular religious practices?