Before answering the question in the OP, we have to ask what ecumenism means.
In the middle of the 20th Cent, there were thoughts of uniting all Protestant denominations into one. In sone countries this resulted in "united" churches e.g. Canada. In the US nothing came out of it. Catholics have historically wanted everyone to become Catholic.
At least in the US, that type of ecumenism more or less failed. Today it mostly means working together in areas where we can, recognizing each other as fellow Christians, and mutual recognition of sacraments.
I don't think a single large church organization is necessary, or even necessarily desirable. To me the basic unit of the Church is the congregation, and larger units are useful for common tasks and to provide a way to maintain accountability for clergy. So I think the second type of ecumenism is important. Particularly mutual recognition of sacraments. I consider closed communion to be sacrilege, because it turns Christ's table into the table of our own Church.
Hedrick, I think sometimes ecumenically oriented statements can simply be sources of confusion. For instance, our joint document with the Reformed churches called
Marburg Revisited (I'm not sure if it can be considered
status confessionis exactly, but it's been referenced enough), where we suppossedly agree that our different views of the Eucharist are merely acceptable diversity. And what are the fruits of it? Our kids are continuing to be catechized the same way they always have . So what was really done with
Marburg Revisited? It's mostly two things 1) a gesture of goodwill towards fellow Christians with whom we share a great deal of theological common ground 2) a potentially confusing message and witness to the outside world about what our churches really believe, teach, and confess.
Lets put it this way. In our congregation some people bow at the Words of Institution or the elevation of the bread because we really believe Christ is present there. Some Presbyterians, no doubt, consider that highly problematic, flirting with idolatry. And yet
Marburg Revisited can give the false impression these differences are mere trivialities and obscure differences that still exist within our respective traditions.
A Reformed Christian might say, so what? After all, typically Reformed concede less in ecumenical dialogues like this. But from the Lutheran perspective this goes closer to the heart of a sacramental worldview that pervades our theology, hymns and our liturgy.