OK immigrants:
The net immigration from the EU is currently around 180,000 per annum (i.e. three Arsenal home games worth). This is a historic high: in the 80's net immigration from the EU was negative i.e. more people were going from the UK to Europe than the other way around.
So let us say that this historically high figure stays the same for the next ten years. What does that actually mean? Obviously, there will be an extra 1.8 million people here from the EU. The population is now around 65 million people so that is around a 3% increase. That means the difference between out and in is you go to A&E in ten yours time and there are 50 people there if we leave and 52 if we don't leave the EU. The class that your grand children are in has 31 people in it instead of 30.
Is that really so ad? And remember, this is if immigration remains at historically high figures. If our economy has a down turn (very likely if we leave) migration will move in the other direction, except it can't because the EU, in a tit for tat measure will stop our citizens from seeking work elsewhere in its borders.
The immigration argument is a total dead duck.