A rabbi should not despair if people do not do as much as they should. Every parent has that with children. God is merciful.
That still has to be there. And so, it's kind of an interesting question you brought up. Because, on the one hand, yeah, it'd be lovely. I certainly don't see that happening. In fact, I see the opposite happening.
Ours is an open and accepting society, and has historically provided an avenue for lawful immigration to all those willing to accept the responsibilities of citizenship.

