I don't disagree to your point. Yes we grew up in that culture and there will always be a place in  your heart for it and yes i too feel in a way that i have been disconnected from the culture, values norms etc that i grew up in.  There is no way that we will be able to replicate the same situation here with what we have but we can at least try and give it our best effort to not let go of it and to pass on the best of what we have to offer  to the next generation. 

given the circumstances we are in, in my opinion a lot of people would not have hesitated to go back to Nepal only if things were more stable politically and socially. But such is life, you suck it up and move, especially if you have a kid you would want them to have the best of the worlds and that in my "biased" opinion is only possible if you live in a stable society.