The Springboks showed that they are still the best rugby team in the world, with a comprehensive win over England.
Australia and All Blacks had tough close games, but the Boks cruised, while playing in second gear for much of the match. Boks also had lots of new players and combinations, or players that were perhaps not first choices.
Rassie has built player depth, so even if some players like Eztebeth do not make it to the next world cup, the Boks still have options.