Chinese Foreign Minister Wang Yi calls on EU, Britain to work with Beijing and defend the multilateral trading system.
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There’d have to be some significant milestones:
China would have to produce entertainment content that rivals Hollywood In Mandarin
A programming language based on Mandarin would have to gain popularity
A large diasporia of Chinese speakers
Probably a large Imperial expansion of Chinese territory to other parts of the world
A change in internet protocol to favor mandarin-speaking channels or a new communication channel to rival “the written word” “radio” “telephony” and “the internet” that is purely Mandarin
A change in medicinal practice, pharmaceutical manufacturing etc under which speaking Mandarin is easier than any other language
China would have to gain unilateral cultural cache such that kids and adults alike see China as cool, powerful, interesting, exciting, friendly, aspirational, rich and free.