What's missing from the article is the key word: Communism.
Mugabe is a communist. His army is staffed with communists.
Communism has failed in Zimbabwe, failed in the CCCP, failed in Cuba, and failed in North Korea.
The Army can take over Zimbabwe, but what are they going to change? They are communists. The communist answer is price controls, enforced at gunpoint.
Antonio Gramsci said that true Communism would *always* fail as the people/workers would eventually come to see the ruling Communists in the same light as they once viewed the ruling class in capitalistic societies...as the new boss...leading to inevitable popular rebellions against communism itself.
This happened first in Poland under Lech Walensa, then East Germany and Czechoslavakia and Romania et al. It will happen in Cuba once Castro dies. It will happen in North Korea.
And it will most certainly happen in Zimbabwe...
...but the question there is what will replace it?!
A rebellion or coup by the Army would likely as not lead to totalitarianism, martial law, or a far harsher version of Communism than Mugabe's current failure...hardly an improvement for the people there.
And the population at large of Zimbabwe isn't educated enough to grasp the benefits of capitalism or democracy. Their main real hope is a benevolent dictator or tribal law/rule, save for a re-colonization by the West.
At least most African tribal law permits low-level capitalism (buy/sell/trade by individuals).
In the near-term, an outright invasion of Zimbabwe by one of its neighbors is a very real possibility...and explains Mugabe's otherwise ridiculous purchase of new combat fighter jets.