T... What is their motivation to remain affiliated?
My teacher and other teachers around me do have personel ties to hombu or to certain shihan. I am used to teachers who lived in Japan, be it for some months, be it for some years. When having a meals during seminar, it sometimes happens they start to talk Japanese while remembering stories. And not only the teachers, but my sempai also started to go to Japan on a regular base.
And I am used to teachers coming over from Japan to give seminars here.
In my context I myself (sandan) am a member of the first generation that is not directly connected to hombu or Japan through our own biography but only through our teachers or sempai. So me / we will have to find our way of being connected - or letting go.