Having French as mother tongue, I always find fascinating when the French and German official bodies go postal about such a topic. It’s like looking some parents complaining of the retro-influence of some common bastard children. :P Now, there are languages for which Globish can be part of an existential threat, but German and French are nowhere close to this. See https://en.wikipedia.org/wiki/Lists_of_endangered_lan…
Esperanto is still frustratingly complex with regard to phonemes for an international language. I think most speakers of many European languages don't realize just how complex their phonologies are on average. Slavic languages probably take the cake there with stuff like 5-consonant clusters that can even include sequences of plosives and affricates, but then you also have Germanic languages (and French!) with their…
But I agree that overly large phonemic inventory is a problem. On the other hand, it seems that languages either have a complex consonant system but a simple vowel system; or a simple consonant system but a complex vowel system; I haven't yet seen a language where both systems are simple (Japanese vowels have tonality, so it's not a simple system IMHO), probably because the words in such a language would have to be quite long.