Planet earth will need a plague like the Black Plague if earth is to survive. That's just a fact.
The Earth itself should do just fine for a long time to come. The question is life on this planet, human life in particular.
Plague and natural catastrophes (super-volcanoes, asteroid impacts, etc.) are natural events that could permanently zero out human population growth. Large-scale warfare, genocide, and resource depletion are human-caused ones. Widespread famine has both natural and human causes. Plagues have both sources too: natural evolution of new pathogens and pests; human hygiene practices and over-use of antibiotics, pesticides etc. (i.e., selective breeding of more virulent pathogens and pests).
We need to pay more attention to what we humans can control; less to those things we cannot stop.