Is one-world-language a good idea?

[Dystopia]

I personally like the idea of having a single worldwide language. By that I don't mean abolishing existing languages, rather choosing one of the existing languages as the primary language for the entire world. That way, there would be a single global language which everyone will know and will be able to communicate in, alongside their local language/s if they want to be bilingual.

Positives:
+ Ease of communication.
+ Less confusion with future interpretations of texts, especially with religion.
+ Easier to relate with one another.

Negatives:
- Partial loss of cultural diversity.

Here I am reviving old threads!

I think English is already the standard world language - Sure, Mandarin is becoming more important with the rise of China as a worldwide political power, but English is still pretty much expected to be the form of communication between foreigners.

In my country there's English from basic school to highschool and it's not optional - That being said, I have lots of friends who suck at English and teaching methods might not be efficient all the time.

I really don't know what a worldwide language would mean - But overall there is no political institution with power to force others to learn one worldwide language so it's basically a matter of choice.

I work hard to make my English more fluent and as fluent as possible and I've been doing that since I was in the 5th grade - But sometimes people don't even have resources to learn their native language correctly, let alone a worldwide language.

I do not think this would cause cultural loss since languages (native ones) would still be spoken... And I think certain texts like the universal declaration of Human Rights should be written in several languages, since for now not everyone is fluent in English.