I know this is a contentious subject but there are some interesting areas for discussion on the subject of Immigration.
It seems to me that a lot of Eastern European migration is about coming here to work and make money but NOT as in my father's time to necessarily settle here for good or at least for a long time.
Many Eastern European workers I think probably plan to return home when they make enough money and when the economic situation in their country improves, which I believe it is beginning to do so in Poland
I personally think what we are seeing is a sort of mobile work force and this is a great challenge for the way we see home, culture etc.
People are more mobile and are choosing to work in different countries through economic necessity or choice and the whole concept of what we call 'home' and our sense of being rooted or connected to where we come from is being lost.
However we had a massive influx of foreign workers (white, from the USa and Europe) in the 80's some of ehome setteled her for good many who stayed only a few years then moved on but most of them were bankers and city traders so no-one worried about them.
We do therefore have to be careful about how much of our feelings are genuine concerns about loss of belonging and rootedness and how much are about being scared of being innudated by "poor unwashed" foreigners. The latter leads to a lot of fear and blaming of individuals which is not only wrong but pointless.
I think immigration from countries where living conditions are intolerable if you are poor or where Human Rights violations are common is probably bit different in that many people feel they have to stay away from what is their home in the longterm.
Nonetheless I do believe that most people who decide to become migrant workes do so through the desire to improve their lives but if asked I'd say the vast majority would prefer to stay in their home country as long they felt they could live their in reasonable comfort and safety and with reasonable opportunites to improve their economic situations.