What i think of this so called ethnic revolution is that, it is too sensitive to be mixed in a big revolution. Lines will be crossed, emotion will prevail over mind. Ethnical issue will turn into regional (as same ethnic group from different states will have different priorities after states are divided). People will try to stick to their ethnicity as the primary dividing factor will be ethnicity. Do we want to keep this ethnical barrier? It depends on people you talk to. Personally, i think the best way to go forward is to blend in all the ethnic groups, so that the next generation will be more concerned about development, money and inclusiveness of the society. More you divide, more easier gonna be for politicians to rule us and bigger the chances for corrupt politicians. Then after that comes the emotion where people are afraid that their distinct identity will slowly disappear which was as long as 3 4 thousands ago even before there was Nepal or any other country. Other identity will get the upper hand and coming generations will be barred from studying the distinct heritage that we came from. That concern is very legit, so whats the middle option we got? I think best way to go is first see if the ethnicity based states are economically feasible and socially sustainable? If the answer is yes then next question is if it is in the best interest of majority people? If we can say yes to both questions then why not? Bring in all communities together see which communities are behind and need help coming forward, give them the identity and opportunity they need instead of inciting people against each other.  
If it is not possible to have ethnicity based identity for economic and social reasons then why not sit together and see which particular ethnicity needs help and again same thing give them the help they need at the same type keeping the competitive development in place. Let the janajatis have their own proud history in the new curriculum and teach them the bond it shares with other ethnic groups. At the end, it should be about helping each other, however we do it do not matter. Only thing that is important is the peace in our country and smile on face of our next generation.