Feelings of loneliness and boredom are ingredients of happiness.

Why did Esperanto fail? Because it was created using the "Tolkien method": based on subjective criteria of euphony. There are many other reasons but this is the main one. Creating a universal human language should be the work of talented mathematicians. If this language proves convenient for the majority of the planet's intellectuals, then in a century or two most humans will know it.

The most probable WW3 scenario: China starts a war against America for Taiwan, then India and the European Union join China, then Russia joins America, then a new "communist" revolution in Russia begins...