All I'm saying is... if that one foreigner is motivated enough to stay in the Netherlands, he better damn well learn the language. He/she will have to anyway, in order to adapt in social settings.
I guess English will evolve too, there will be a lot more influence from other languages, caused by the internet.
(In Sydney a lot of taxis are driven by recent immigrants who's English is sometimes less-than-ideal, despite some kind of mandatory-English requirement. If they have a mandatory English requirement in The Netherlands for taxi drivers then the bar must be a lot higher than in Australia!)