The way that English turns into the only language in the world could give rise to both positive and negative effects on society, culture, and economics.
On the one hand, English could pave the way for faster, cheaper, and easier communication; moreover, it could manage to eliminate the language barriers, which is expected to foster traveling, facilitate trading, and international cooperation. Thanks to the predominance of English, global mobility could be simplified with fewer challenges in adapting to new environments.
On the other hand, the dominance of English would significantly pose many challenges to cultural diversity. Due to the tight connection between language and cultural identity, the extinction of a variety of languages might lead to the loss of unique traditions, histories, and ways of thinking. Furthermore, the supremacy of English might worsen social inequalities. While proficiency in English provides access to various opportunities, those who are unable to learn it might find themselves disregarded. Besides, they could face language barriers or communication breakdowns.
In conclusion, the predominance of English could lead to both benefits and consequences for society, culture, and economics.