Look, the SSPX makes no "demands." It is Rome who came, hat in hand, to talk about "reconciliation". Of course the Society will obediently discuss anything at all with the Holy See, according to its wishes--but it will not compromise Tradition for the sake of getting along with this Pope or with any of his successors. It is the Pope who must first reconcile himself to Catholic Tradition--then all else will follow.
The quality of a man (JP II) or of an institution (the Roman Catholic Church) can be judged by the nature of his and its enemies. I feel sure that JP II and the RCC will always enjoy the good reputation that arises from the hatred launched at both by the nasty little schism of self-important excommunicated and dead Marcel and his remarkable cult of self-deluded trick ponies.