Robert Mugabe should be shown the door as quickly as possible, but I don't think he's going to leave until he has to.
And I don't think the general strike is going to be enough to get him to go, because I'm not convinced that he really cares about the economy of Zimbabwe anywhere near as much as he cares about keeping down the opposition.
That said, he's also got little in the way of crutches to lean on to retain power. He can't blame the wealthy white minority, because he expropriated their land and wealth, and trying to call the opposition "terrorists" is just pathetic. He'd better be sure the military is thoroughly on his side, otherwise he could be looking at a coup.