I entirely agree with you about the value of maintaining diversity but Iv was pretty much pointing out that Esperanto was vetoed in order to prevent an increase

I entirely agree with you about the value of maintaining diversity but Iv was pretty much pointing out that Esperanto was vetoed in order to prevent an increase in diversity. French was the diplomatic lingua franca and the French delegates were working very hard to maintain that. English is now the lingua franca in many fields due to US hegemony as you say. Even though it's not due to any inherent virtue it's not, of itself, a bad thing. I'm not a big fan of Americanization (sic) but that's a slightly different thing from a common means of communication. The latter may well mean we have to suffer some of the former but I personally think it's worth it (don't tell my daughter I, like, said that OK?). Obviously this will never happen but now would be great time for the EU to adopt English as a common tongue, precisely because of Brexit. It'd clearly not be because of a cultural dominance within the EU and it would save a ton of money and a lot of wasted effort. I await the response of the Académie française with bated breath.