> lingua-franca of the day that is English. Of course neither German nor French would be a better alternative as a global international neutral language.

Being a linga-frinca has nothing to do with merits though.

Aside from "linga franca" being literally "French", it's a matter of which group of nations have a tremendously dominant position on the international scene. If China was to take hold of India and Russia and set the rules for the rest of the world, the defacto linga-frinca won't be English for long, however intricate people might feel about Chinese.