Their separate existence is a myth. For science, music, sport, etc, Europe uses the same vocabulary. Everyone realizes why a new common language would be desirable: one could refuse to pay expensive translators. To achieve this, it would be necessary to have uniform grammar, pronunciation and more common words. If several languages coalesce, the grammar of the resulting language is more simple. If several languages coalesce, the grammar of the resulting language is more simple. To an English person, it will seem like simplified English, as a skeptical Cambridge friend of mine told me what Occidental is.