The LCMS convention recently decided to reaffirm the 6 day creation! Here is the CMI article about it: Lutherans take stand on creation - creation.com.
Looking forward to hearing from @J.E.S, @CPArand, @Philosurfer, @JustAnotherLutheran, @Mlkluther, and @EvolvingLutheran and other LCMS about this. I also encourage you to look back at this: The Lutheran Option.
My thoughts are that this isn’t a change for the prior LCMS position. It is a bit entertaining how it is being misread. Even if the six days of Genesis are “natural” days, the earth could still be old. The length of the Genesis days does not allow us to compute the age of earth, even when taken as “natural days.” Period. So it is a mistake to read that statement as endorsing YEC.
See here for example: A Telling in Six Ordinary Days. Of course, there are many other ways to deal with this. Perhaps, most obviously, the earth exists before Day 1 in Genesis!
This covers a more important point:
The resolution also encourages pastors to study reports from the LCMS Commission on Theology and Church Relations, particularly Creation in Biblical Perspective (1970), Together with All Creatures: Caring for God’s Living Earth (2010) and All Things Hold Together in Christ: The Intersection of Science and Christian Theology (2015).
Finally, the resolution instructs pastors to focus on teaching the parishioners they serve, especially youth, about these issues. It asks pastors to equip their people to give a respectful Christian witness about the biblical teaching regarding creation and the intersection of faith and science.
This component of the resolution, in contrast with the non-statement on 6 days, is a substantive affirmation in the LCMS position, for the better. This is where the real news is. What was the final text of the resolution? Does anyone have it?