I did not watch the video, but I'm not surprised that a plague affecting bananas would have a major impact. Nearly every banana tree in commercial production today is a Cavendish banana, and the Cavendish banana can only be reproduced essentially by cloning it, so every banana tree and commercial production is genetically identical, therefore susceptible to the same diseases.
A few years ago I recall reading something in an article sounding the alarm that if a disease came up that did effectively get past all of the control chemicals sprayed on these trees, it could decimate the world banana production.
