Somebody: Sure. Bolivia was doing moderately well under it's left-wing government when the global economy was strong, well enough to save windfall gains from high commodity prices. But, it sort of undercuts those who criticized Evo Morales and MAS for being centrists or who attacked Bolivian Vice President Alvaro Garcia for endorsing an "Andean capitalist" path for his country. Really, when you think about left-wing alternatives in poor and middle income countries, I think you've got to focus on improving public health, education, and infrastructure. Overthrowing the bourgeoisie is exciting, but it doesn't seem to last very long.
It's interesting. The Democratic People's Republic of Korea is celebrating it's 62 anniversary. Cuba's revolution is about 52 years old. In both cases, it's safe to say you're dealing with regimes on the verge of moving from moderate capitalist reforms to more thorough-going economic transformation. The Russian Revolution lasted 74 years. What is the life-span of a socialist regime? It seems to be at most around the length of a human lifetime.