There are two issues in this discussion - one, the MPL; and two, SAA's interest in it.
The MPL may indeed have some merit - at least there has been and continues to be in-depth investigation at an international level of these possible merits.
The problem is that SAA will not even give the MPL as much consideration as it has been given in this very thread! SAA want black pilots, and they want them as quickly as they can get them, period. And if something called, eish, an MPL, can help with this, then, hau, that is the way to go, yes.
If there were a licence which enabled you to be an airliner pilot after gaining 200hrs in a taxi, you can bet your bottom dollar that SAA would be trying to implement it.
SAA is as a microcosm of the New South Africa. Study it's chequered history since 1994 and look at its intentions - they truly reflect the state of the nation as a whole and give a very good indication of what we can expect in the nation in the future.