Wel, i am not much of a family-guy myself but can imagine what you go through as I have loads of friends in similar position to yours. I do, on the other hand, understand your husband. He is in his country, has friends there, family, job and does not feel any "need" of moving anywhere I guess.
In my opinion you can not force him to leave, it must be decision of you both, and be careful as well not to break anything. My advice.
He is a native speaker, he will always find a job in here, either teaching english, doing customer service for Dell, AT&T, IBM or whatever he would prefer. I am pretty sure of it.
Anyways, good luck!