Do you think the UK will break EU policy and go for protectionism? Ultimately importing foreign workers is likely to become more common in the future. Improving workers skill-set is the best way to increase job prospects in the future.
It won't though, because unfortunatley not everyone has it in them to gain a University level qualifications, and are stuck in basic jobs etc through no fault of their own. Should we just forget them because due to cheap imported labour they can't earn enough to maintain a basic standard of living, and let them claim benefits, which is costing us. Or keep them doing the jobs they are able to, have them earning enough to have a standard of living and pay taxes?