I'm not advocating a world dictatorship like Venezuela or North Korea. Venezuala is a capitalist country despite what the fake left government might claim. North Korea is a stalinist bureaucracy desperate to transform themselves into capitalists like in Russia and China.
What I'm advocating is a unified planned world socialist economy based on what people need, rather than the profits of a few. Then people can live happily in there own countries or wherever they like. It would have to be a dictatorship of the vast majority over the tiny minority for a while, just long enough to ensure the billionaires don't try to mount a counter revolution.
Once the world economy is humming along without artificial national boundaries, without wars and so on, then we could all enjoy a very high standard of living.