Thee are two ways of Christians: way of production and way of consumption. These are not quite the same as sanctity and phariseism, or liberalism and fundamentalism, or openness and exclusiveness. But some people fo to the Communion to consumpt a bit of Eternal Life, and this is quite legitimate way of comsumption, producing saints.
And some people go to the Communion to overcome the enmity between people, and this is the Communion which produce unity, future/present unity in God.
I am afraid that any Communion is intercommunion, because until the Second Coming even spouses remain far enough from each other to speak about ther "inter"-relationships.
Also, it is senseless to discuss intercommunion under present Church situation. The problem is not how to unite different Christian churches. All confessions first must become more Church, more Christian. What the sense of uniting caricatures on what the Church must be!