Too slow. While the world waits for "sanctions" to work, Mugabe will complete his racial cleansing of the white farmer class, his physical extermination of the black opposition, and his mass starvation of recalcitrant rural elements. It would be better to send in a Commonwealth expeditionary force of Britsh Marines and Gurkhas, and elements from South Africa or other black African states, to throw Mugabe's thugs out and install the legitimately elected government. But then again, pigs might fly.
South Africa will never agree. Sod them, we ought to do it on our own and leave Mugabe's body hanging from the nearest streetlamp in downtown Harare.
Regards, Ivan