I have always wondered how it is living with no need to learn/speak other languages...must be confortable and easy...
But, everytime I have been to France (I don't speak french) I had to cope with french people doing whatever they could in order to avoid
successful communication simply because I couldn't speak french...no matter if I was able to speak good english, spanish and italian, sometimes there was really no way to communicate with those french that threat you as an idiot.
On the contrary when I went to spain people tried to communicate with me and other italian people, and it was possible to communicate even if we were speaking italian and they were speakng spanish. The result of this more open approach is that I learnt spanish!

Thus I wonder, could the lack of need to learn and speak another language possibly restrict people's mind? ...the answer is up to you english speakers ...you are the experts on the issue of "monolingual" people