Don't think that's going to happen, not how this team works. Probably needs to be dropped before he costs the Boks badly, but will not be. It's a bit of a Jaco van der Westhuizen situation, Libbok is similar to Jaco, Jake just cut him asap back in the day and moved on.
Looks like Rassie sees it developing like this:
Fullback: Le Roux/Willemse, Fassi
Flyhalf: Pollard, SFM, Libbok
Should bring Siya Masuku in to replace Libbok, he can kick goals under heavy pressure and has a low error rate in general play. I would feel more comfortable with someone who is solid as squad flyhalf.
Kicking should be a Bok strength, not really acceptable to not have at least one player on the park capable of landing anything in the opposition half under pressure and another player capable of landing anything 10 metres into the Bok half if it's more or less in front and the main kicker doesn't have the range. it's one kicker that lands everything and another with a massive boot who kicks straight and lands less because they're difficult. It's an area Rassie has neglected, he needs to test more players from range (Faf got one kick from range at the RWC, seemed to have a big boot, didn't get the chance again). Reckon De Allende may be capable of kicking big and straight, he was practicing some big drop goals during captain's at King's Park.
At flyhalf/fullback it's best to have one running player and one more kicking orientated. The Boks usually go with the running player at fullback and the kicker at 10 (not always, Jake did it the other way around). For the Boks SFM would be better off at the fullback if he wants to use all his talent, I don't think that's the plan though. Pollard used to be a running player (a greedy one who didn't pass), now he almost never runs and is mostly a kicking player. Libbok struggles because Rassie doesn't like a strong kicker at the back, no players selected like Percy or Frans, so Libbok under pressure sometimes means no kicker. If the opposition isn't being punished with the boot for cheating then they cheat more and everything becomes harder.