This is an interesting thread, my grandmother only used wool batting and I remember helping to take the quilts apart every year for cleaning and then retieing them.
Last year I talked to a wool shop and they told me you can use a wool bat in a quilt, and just wash it in the quilt. The friction of the fabric and wool will cause it to felt, and you will still end up with a warm quilt. I never have tried this, but I want to with a crib size quilt, just to see what will happen. It would shirley be warm. Has anyone tried this?