Any possible solution will cost the West so much that living standards will fall and no politician would put forward a policy that would result in that.

The only realistic way to deal with the problem is to accept that migration can't be stopped - it's been going on for millenia - what makes anyone think it can be stopped now?

Far better to accept that migration will continue and rather than spending time and money trying to stop it, (about as effective as Canute trying to hold back the tide), let's put efforts into dealing with the problems it may cause whilst at the same time taking advantage of the benefits.