True.
Nations like Mauritius that has heaps of languages incorporated in it's cultural growth has offered many of its citizens as linguistic opportunities in many fields around the world like the UN.
I remember dating a nice little Mauritian who while sitting in George St Maccas was telling me some Chinese guys were hanging crap on me in Chinese. They stopped when I looked at them as if I was reading their minds.
But it really does come down to utility. France thinks it's language is superior mainly due to Political competition with Britain. But Britain is stepping back (Brexit) to leave the French out in front
"You wanna be top dog, well - let's see how you go dealing with Islam for Europe, etc". French is not a flexible language for 'international' utility.
Nihonese (Japanese to the Media) sounds like someone is constipated and would never take off internationally.
Latin will always be around as a 'Scientific' language even though most 'non-scientific' people can understand it. It also seems to be more fluent to Music.
English for Politics, Latin for Music because Latin 'sounds' better with music as you don't need to understand it to enjoy it.
I find that the Maori enforcing all NZeders to speak Maori is no different than Boers forcing everyone to speak Afrikaans in South Africa. I think that's just cultural bullying.
Tolkien has brought much entertainment with the use of language, as has Shakespeare and people who learn Klingon.
But these are very very minor language variations of novelty more than utility, though Tolkien did create his from original languages from long ago.
Even if there was one Common Tongue spoken internationally. I think its great that there are many other languages available to use for whatever... like the language of love that a couple create together for their own private use and love for each other.
A few weeks back, I've enjoyed learning the 'clicking' language of the Xhosa, San, Khoi.