I know you must already be doing this, but please vocally stand by him. Let him know you're there for him. That verbalising of support goes a long way.
Also, I completely agree. If I can't handle myself, mentally, emotionally or financially, how can I be expected to deal with another completely separate and different human being + their family? Let me learn who I am first.
I am and so are my parents. They know what it takes to come to a new country and start a life from scratch. It's not easy. So whatever he needs to do to set himself up first, he should it. Besides, my Chachaji isn't the type who can be easily pushed around or pressured into doing something. He's quite sensible and more than understands all the family politics that people try to involve him in, but he doesn't fall for their tricks easily.