Wow. That's a tough one. I doubt they will ever stop shunning. Even if they publicly ( as they do now) say they do not shun, it would be understood.
I used to have friends that moved away( prior to internet) and we would talk only a couple of times a year. We just picked up where we left off without it feeling uncomfortable or awkward. I always knew they loved me and they knew I loved them.
Honestly if my family shunned me for any length of time it would be very difficult to let them back into my life I would not be able to trust them. I would need for them to apologize but doubt that I could pick up where we left off.