They will never go back to Laos. They have moved their entire villages to America and live by the same rules with government benefits. Why should they? A realitive of mine is a teacher in a special school in Minneapolis for teenage mothers. Many of her students are Hmong. There is a serious problem with arranged marriages for young teens. Another thing is that many Hmongs are polygamists. That is supposed to be a bar immigration but in the name of multiculturalism is ignored.
Interesting you focus so much on the problems they cause here rather than the problems that made them leave in the first place. Get rid of why they left and then you will not have to worry about them wanting to move here.
Contrary to popular opinion on FR, not everyone in the world wants to move to the US. Just because you and I think it is the best country in the world doesn't mean that everyone else does.