You would see the Indians, Arabs, Chinese, and Cape Coloureds achieve equal status earlier as the United Party does what it can to keep power, increase support numbers, and defuse racial tensions. The problem of giving power to the black majority would not be realistic until at least the 60s (cultural shift as well as the belief that the black population needs to be educated/prepared) and by then, watching the horrors that came about in Uganda, Zaire, Central Africa, and elsewhere may give them pause, especially as the black population becomes militant. Very real fears of violence, property seizure, and oppression will have to be dealt with. Will we see early requirements such as certain education or economic requirements to be enfranchised used on the black population, possibly districts created to limit black representation? I think the 80s is the earliest large swaths of the black population will be allowed the vote and even that may be too positive an opinion.