If we started the process of catching and deporting all of the illegal aliens who are currently in our country, it wouldn't happen overnight. The whole process would probably take a few years at least, perhaps longer. While we are catching and deporting the illegal aliens, we could start letting in more legal immigrants to take their places. In this way, employers wouldn't find themselves short of needed workers, and our economy wouldn't be negatively affected.
THROW THEM OUT AND HAND THEM THE BILL FOR THE FLIGHT.
When the boomers retire, and all the illegals are evacuated under your plan, our economy will sink into a depression that would make 1929-1933 look like a walk in the park.