This could be a serious issue and it should be handled as such.

USA is not for everybody. While there are thousands, if not millions, who cannot speak English well in this country; language impediment will make life harder in the states for minority group like ours. We don’t have large communities like Chinese, Spanish etc and as such the weakness is more exposed.

Depression is a serious issue and could have serious implications. Sometimes change in environment could help and I kind of agree with your assessment of sending him back. Language issue won’t be a problem there and he will have people to care for him, at least compared to US. However, forcefully sending him could be bad.

I would arrange a surprise intervention for him. All the friends gather up and when he gets home you ask him to sit down as you guys want to talk to him. Tell him that you all care for him. Tell him he is not a failure but he just needs a change of scenario. Tell him he is better off in Nepal. Offer to pay partially for his ticket since you all sincerely care for him.

Depression can be dangerous, take it seriously and act fast.
Hope that helps.