SN (I hope) will develop a comprehensive network in Africa as a whole (preferably within the 1 day rotation limitation), not fearing the competition with established airlines on main cities.I think the error you're making is to SN as the generic Africa-specialist, whereas I see them more as the specialist of the difficult places to fly too in Africa... Any destination too obvious and it is invaded by all the other EU airlines too and they will always win the upper hand thanks to the much bigger volume they can rely on.
With a lot of help from LH (and the wider STAR community) SN could certainly try to hold grounds in the face of competition, but is this really what they should waste their unique know-how on??? Better let LX and LH do this easy job and move into more adventurous and often also more lucrative terrain.
I hope that they can successfully implement the brand to mean "the specialist of Africa" and not just the "shyer (or the backer) of competition" . With the latter (low) profile, the airline is sure to eventually fail as a viable entity (and sooner than later, see the state SN is in today a bird for the cat).
That's why I think that Sabena's past network in Africa should be restored and developed more. Yes to me SABENA is the model to follow as far as the african philosophy is concerned.
Also they will need to refine their product and offering to connect "seamlessly" and attractively with other carriers .
And -last but not least- they should try to position themselves more effectively as a main cargo operator to Africa.
And for that maybe after all considering the 747-Combi would be a good idea (to investigate, it was not my first feeling but I nearly changed my mind on that, it all depends on the operating costs of the jumbo)
So, meanwhile leave South Africa to others... ?
But there are no candidates to serve the route so maybe still a daily A330-200 could be considered (although more as a cherry on the cake .. but first u need the cake
After all it could be a "near 1 day rotation"
BTW 40% local pax /60% connecting pax, is very common , LX or KL have usually the same (or even less locals)proportion on trunk routes. The problem with sabena was that their product was not strong enough to upgrade the yealds. But with time and a better product (and a strong alliance) they could have made the route profitable sure ..