I'm as weary as anyone else of colleagues renouncing the Augsburg Confession in favor of various alternatives. But perhaps one of the reasons that such things seem to be happening with increasing frequency is that we Lutherans have focused too much on preserving "Lutheranism," protecting it, defending it, redefining it, attempting to save it, and whatever else, as though "Lutheranism" were the point and purpose and center of the Christian faith and life. It's not.
If the self-preservation of "Lutheranism" is what the Church of the Augsburg Confession has come to be about, then it is simply engaged in idolatry on a grand scale, beholden to another version of the same works righteousness it is ostensibly so opposed to. Ditto concerning the self-preservation of the LCMS, Inc., though that is surely of less consequence.
The point and purpose of "Lutheranism" is rather to confess, in and with the Augsburg Confession, the faith of the one, holy, catholic and apostolic Church, the faith once delivered to the saints, the faith of Christ Jesus, His Word of the Gospel, His free and full forgiveness of sins, His flesh and blood given and poured out for us, and His gracious gift of life for both body and soul. Where that is confessed in preaching and practice, there won't be any need for either self-preservation or quests for the Church. There, instead, will simply be the Church, the Body of Christ, living in His flesh and breathing His Spirit.