That was kind of my thinking too, the ball was right rolling 2-3 years before the Soviet collapse. Though I know 1994, after the collapse, was a major milestone is finalizing the end of apartheid, so I'm not sure if the Soviet collapse had a large effect... I'm don't know (I didn't think) the Soviets had much influence in SA, but it seems plausible that the upending of world power structures in general broke down the realpolitik dynamics that might have preserved toxic power structures like apartheid, even indirectly. I honestly don't know, except to say that change began before the collapse.