It is now widely believed that essentially all 6000 world languages evolved, by geographical separation, from one proto-language. (This theory tends to undermine Chomsky's claim to fame for theorizing an internal hard-wired grammar - Chomsky's sole interesting idea, in my opinion.)
However, languages are dropping like flies, as the planet shrinks. McWhorter in the NYSun argues that this is a good thing, but he hopes hobbyists will keep the old ways alive.
Will the universal language be English? I hope so. It's a pretty good language, but Italian is far more musical, and I'd be happy to have an excuse to learn it. Would no longer need a translated libretto for the operas I love.