People are free to dance to any music they want to. The issue is not about whether people are free or not, or whether there are other more important things than advocating for language like roads, schools, telephone towers, etc. I don't know if this focus on language has disabled us from developing infrastructures so they aren't substitutes.
I also don't find it practical to disregard Hindi when so many of our people go to India for study and work - true across all classes. To learn Hindi seems to be a compulsion, like learning English.
I think it basically boils down to preservation of one's heritage - given that there are not substantial rewards for beind adept in Nepali apart from the civil sector jobs that many of us don't want anyways. While I think preservation of culture is important, and can say something along the lines of one's identity, I realize it's not as strong an argument.