Communist takeovers can only happen via revolution, bourgeois "democracy" won't ever allow it.
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EFF is basically setting up for a collapse of the ANC government and either taking power electorally as the failing ANC capitulates to their popular front or by guiding the next crisis into a revolution.
The KPRF has no crisis to leverage for themselves as both URP and the KPRF are looking good for their support of the SMO. If the URP starts fucking up the SMO you can expect the KPRF to gain more traction especially in the new republics and the borderlands. I'm not kidding when I say that Russia could electorally come back into Socialism since it has such a weak bourgeoisie that's totally reliant on state intervention and the international trade system. Having already been a workers' state the nation has the muscle memory for it. They just need a vanguard to awaken it.