Yes, the coaches of the Stormers, Lions and Sharks are relatively unknown outside of South Africa.
John Dobson who coaches the Stormers/WP started out as a coach at university level, and had success in the Varsity Cup, and from there got promoted to the U/21's and then the senior sides.
He has been involved with the Stormers/WP for the past 6 years.
The Lions coach is Ivan van Rooyen, the youngest of all the coaches and last year was his first term as a head coach of any team. Prior to that he was the fitness and conditioning coach of the Lions when Johan Ackermann was the head coach.
Sean Everitt is the Sharks coach and has been involved in Sharks rugby since 2008, where he started out as coach of the u/19's then u/21's then currie cup and ultimately Super Rugby. He also used to play for the Sharks.
I think there are a lot of good young coaches coming through the ranks. And with the Boksmart campaign we have in SA, there is now a real drive where coaches from high school to senior level are all on the same page, and attend conferences and coaching clinics spearheaded by Rassie.