I don’t think anyone is teetering on the edge of poor discussion. Not even close, actually. If anything, I think every single poster has been more than reasonable.
That said, you are right- what more can be added?
If you fear that some poor discussion is going to occur, might as well just lock it up now. No sense in burdening yourself or the other mods with that in the back of your mind. Go have a beer and hang out with the family.