Yes donor match (it's a geometric issue) is an issue but tissue rejection hasn't been a problem at all in the clinical trials because there's no blood supply to the disc (that' what I read from the doctor in HongKong who does this).
Anyway..this option seems too far away
. But I am sure they'll figure out a way someday. In the meanwhile let's hope all the problems with ADR is resolved and it will regarded as a cure rather than treatment.
Sonata