I think this will be a good idea for a better Nepal.  If the zone or states are divided based on diversity and demographics, it would be easier to formulate policies and programs targeted as per the nature of the zone. 

It was the same thing in the past but it lacked proper vision and strategy.  Development projects, infrastructure, and budgets targeted for the specific zone will ensure the development of that zone which will make a better Nepal.
But lets hope these politicians dont ruin it like the old days.