I don't see how South Africa can either plan for or cope with much of an increase. At the moment Zimbabweans are streaming into the country at around 2000+ a day with the total now standing around 2 to 3 million (it is difficult for authorities to nail down an exact number since most enter the country illegally). This means around 5% of the SA population now consist of Zimbabwean immigrants. For the same reason, I think calling for an invasion is not a good idea - imagine what would happen with the number of refugees once they also try to avoid getting caught up in a war.With plans to nationalise industry and mining, RM is desperate to cling on to power, his days are numbered. SA and the UN are already planning for a massive influx of refugees once the final collapse occurs.
To be honest, I think it is time someone takes RM out, but one can only hope...