My take on this has always been the same - if you don't come from a family with a decent Financial status, it'd be really stupid of you to return home permanently (unless you're working menial jobs and struggling to maintain your immigration status). You can literally forget about making money to not just support your parents and spouses (and kids) and on top of that, buying land and other fixed assets. For women, Nepal has/was and will continue being a shit-hole thanks to us, men making Nepal a predominantly male-dominated society. 

I'm sure you know of people who've returned home permanently, but from my own personal experience, my acquaintances who seem to have peace of mind are the ones who returned home right after college or completed their pursuit of higher education and always had a backup plan (in most cases, it's the affordability to live off parental properties/income). When you work hard to get great grades through your undergrad and grad school years, does your potential earning back home do justice? Why'd you wanna quit your job that pays you anywhere from 60-100k per year? 

From my own perspective, I'm sort of 'thankful' that I'm not tied/committed (no kids, no job related to my speciality). If I were a US Citizen, I'd be in Nepal right now. In fact, I'd probably be way better off returning home for good instead of lingering around, but I just don't wanna gamble. I wish to have a back-up - that of an option of returning back anytime I wanted and I won't get that until I naturalized.