Why rejoice if "the crocodile" is to take over?

After refusing for a week, 93 year old Robert Mugabe resigned as President of Zimbabwe, formerly a British colony called Rhodesia, after 37 years in power. Rhodesia is named after Cecil Rhodes, a brutal British adventurer who believed that the British were the "first race in the world" and the Africans were the "most despicable specimen of human being". Mugabe is still credited for rescuing Zimbabwe from British rule but in the end he was labeled an "archetypal African dictator". While Mugabe mercilessly put down any opposition he allowed his family and close friends to loot the nation. His second wife was known as Gucci Grace for her fondness for buying luxuries. His youngest son posted a picture of his watch, with the caption, "$60,000 on the wrist when your daddy run the whole country ya know!!!" Mugabe's ouster is reminiscent of that of Zine El Abidine Ben Ali, President of Tunisia, whose wife Leila Trabelsi was despised by the people and blamed for the corruption. Leila was Ali's second wife and also had a fondness for luxury. Just a few weeks back, L Bershidsky wrote, "Dictators are prone to self-destruction." He quoted a recent paper by Daniel Treisman who "analysed 218 episodes of democratization between 1800 and 2015 and found they were, with some exceptions (such as Danish King Frederick VII's voluntary acceptance of a constitution in 1848), the result of authoritarian rulers' mistakes in seeking to hold on the power". Bershidsky has a personal dislike for Vladimir Putin of Russia and described him almost as a genius. "His suppression has been timely and cleverly measured, his election manipulation always sufficient, his temporary successor, Dmitry Medvedev, avoided the liberal slippery slope, and he's only started wars against much weaker rivals. He helps his regime's propaganda by treating it as truth, but he doesn't buy it to the point of losing his vigilance." So perfect in fact that Putin still enjoys 82% popularity, that most western leaders would die for. Zimbabwe erupted in joyous celebration when Mugabe resigned, believing that a change in leadership will improve their lives. Will it? The former Vice President, Emerson Mnangagwa, sacked for "treachery" by Mugabe, will take over. Known as "the crocodile" because of his shrewdness, he is alleged to have masterminded attacks on opposition supporters in the past. One veteran described him as, "He is a very cruel man, very cruel." People are no better off in the Democratic Republic of Congo after Laurent Kabila took over from Mobutu Sese Seko and Egypt is back to where it was with former field marshall Abdel Fattah el-Sisi as President. Total power is like a baton. It passes from one hand to another.