The very fundamental nature of culture is that it is "EVERCHANGING". So basically are you guys are trying to reverse or stop the very fundamental nature of reality from functioning ? A person will choose the language that is most suitable, most convenient and the one that has the highest value in his/her surroundings. The value of Nepali language tumbles to the bottom as soon as you leave Nepal. If Nepali language were widely spoken around the world like English or French, then the case would have been different. Try speaking Nepali at a your school or at your work or at malls/stores and if you get anything out of it plz let me know.