Common language enables global communication
Language is a tool that allows us to communicate. Two languages defeat the purpose.
This system proposes One Language that all citizens speak, read and write to enable common systems and processes to be communicated and applied efficiently. All signage and official documentation would be deployed in a single language. Administration then becomes more efficient.
Extra languages, whether regional or otherwise, are fine, as long as one common language is maintained and used for all official documents and signage.
Risks: Other Languages are key cultural tools that can be used to separate Us from Them. Mitigation: Education mandates a common global language. No other language can be mandated. Any language can be an education option.