On the basis of most used languages then Chinese ought to become the ICAO standard at some time in the future, although I would guess at the moment there are probably more movements conducted by English speaking teams, see below:
Most Widely Spoken Languages
in the World
Mandarin Chinese tops the list of most popular world languages, with over a billion speakers. English trails in third place, with just over 320 million speakers. This data includes all speakers of the languages, not only native speakers.
Language __ Approx. number
1. Chinese (Mandarin) 1,213,000,000
2. Spanish 329,000,000
3. English 328,000,000
4. Arabic 221,000,000
5. Hindi1 182,000,000
6. Bengali 181,000,000
7. Portuguese 178,000,000
8. Russian 144,000,000
9. Japanese 122,000,000
10. German 90,000,000