The Springboks followed up this year by winning the Rugby Championship for the first time in 10 years, although Erasmus was among the first to note that a curtailed, one-round southern hemisphere tournament means little once the Rugby World Cup kicks off. The Springboks face the enormous challenge of New Zealand in their opening game in Japan.
"The results and performances up to now will mean nothing once we are in Japan. It is a case of back to square one," Erasmus said.
His priorities on taking charge were to fix two things:
First, an ineffective defensive system that saw South Africa ripped apart by opponents. Defence specialist Jacques Nienaber, who was part of Erasmus' staff at Irish club Munster, returned to South Africa with the head coach and has re-organised the defence and rebuilt one of the Springboks' traditional strengths.
Second, and not as straightforward, Erasmus had to rebuild morale, which had been shredded by some drastic failures and a ruthless media.
Erasmus' decision to make flanker Siya Kolisi South Africa's first black test captain appears to have been a masterstroke in that regard.
Kolisi's appointment was hugely popular across South Africa and, crucially, within the squad, where Erasmus overlooked more experienced candidates such as lock Eben Etzebeth, Kolisi's close friend.
The Springboks have the elements to be competitive in Japan: An always-strong forward pack with Malcolm Marx, a contender for the best hooker in the world, Etzebeth's physical presence in the second row, tireless flanker Pieter-Steph du Toit, and experienced No 8 Duane Vermeulen. There are three playmakers in the backline in halfback Faf de Klerk, first five-eighths Handre Pollard and fullback Willie le Roux, and wings Cheslin Kolbe and Makazole Mapimpi have been in try-scoring form.
But Kolisi's personal story may give the Springboks something extra, something that can't be created on a practice field.
The 28-year-old came from a desperately impoverished background and rose from a township outside the city of Port Elizabeth to what's considered the pinnacle of South African sport, the Springboks captaincy.
"When I put on a jersey (I) remind myself who I'm playing for, everybody who has ever been hungry, everybody who's ever struggled financially, everybody who has walked to school without shoes on."
- AP