I do not want to appear hyper-critical but it seems to me that the admonition to overcome polarization may be slightly tinged with poor grace. Really, I think the great problem is that the ecumenical movement arrived on the scene too late. This is one reason I doubt that the Spirit originated it. He is not generally that far off on his timing. There is a great spirit of lassitude toward movements which have to create institutions to sustain and carry them.
Men are sick of institutions.
At the same time the Spirit of God is cutting through artificial and sectarian barriers like a buttered knife through hot fudge. After letting the brethren demonstrate the futility of human wisdom and planning, God may do a little restructuring of his own and frustrate all of our movements. There are tremendous values in being a Christian only, after having pretended to be one for so long. As you also realize, no one can engage in it without risk. Unless he is willing to take the risk, no local pastor or lay leader is really giving leadership.