Just a quick thought on your otherwise excellent suggestion of more immigration, honeydip:
What happens when the child carers we import have children themselves? It's not unknown for immigrants to have children of their own, believe it or not. No doubt they will want to continue to work and will need somebody to mind their children whilst they mind somebody else's. So perhaps we need a few more immigrants. Or perhaps the first lot will stop working and go on to benefits (for which they will have made little contribution).
And then of course (equally incredible, I know) they become old and need pensions (for which, once again, they will have made little or no contribution). So perhaps we'd better ship in a few more to support them in their dotage.
None of these people, of course, have anywhere to live and no doubt the schools, GP practices and hosputals where they eventually live will be full to bursting.
But other than that (and one or two other snags I can think of but cannot be bothered to mention) it's a grand idea. Or are you just having a laugh?