Well, he'll prolly be an outsider kinda anyway because he's not in his native land. He won't feel quite so isolated with a few friends so he might have fun if he can manage enough Polish to do that.
I admit, that this is the first time I am actually going to Poland to stay for a long period of time unlike those short vacations in the past. But I embrace my European culture, I'm not one of thos "americanized" fellows. I speak Polish from my mother, it was taught to me as a first language along with Greek and then I mastered English when I began going to school as a youngster. My Polish is good, but for a commoner, not for an educated Pole that would be able to tell complex words and rich language in Polish. This is because I have done all of my advanced education in English, and only speak Polish with the family and some Polish friends in the neighborhood and school. I'm in Chicago btw.