I have been thinking about this, and I am slightly puzzled because it seems to me that if one team were to win in perpetuity, the sport would just stop. I mean, in the end no-one except the perpetually-winning team would want either to play it or watch it. Clearly it would take a while - the eighties and nineties were not long enough - but in the end, it would have to happen, I think?

JW says that the South African team is the best in the world, by a considerable margin.