Actually changing capital will change a lot in the country. Lot of countries did change their capital for various reasons: like new york was the capital of US before it was DC,  calcutta was capital of india before it was delhi, Kyoto was the capital of japan before it was tokyo. Especially for undeveloped country like us and country with development centered only in the capital, it is very important they change the capital. Firstly development will florish in another part of the country too. Not only will it develop the new capital but also will develop all the surrounding area to this new place. There will be new thinking since it will be a fresh new capital. People will start moving to other places beside kathmandu. There will be another place in nepal where security will be strong too. The value of the land and houses in kathmandu will go down because there will be another bigger choice where the price will be reasonable. People's living standard in that place and its surrounding places will go up as well. There might be more air traffic in nepal. Tourist will not always say that the capital of nepal is so filthy since it will be a new capital. We might change the views of our tourist friends of different countries.

You dont have to change the capital right away. It can be a ten years programm. You can just change some of the department to this new capital. Like department of forrest, department of mines etc. So slowly you move each and every department in 5-10 years period. So you move something out of kathmandu then lot of things will move slowy and steadily to the new capital. Especially we need development outside kathmandu. Personally i think pokhara is quite develop and beautiful for us to go and put our new capital . It is like our natual beauty of our country. So i would think somewhere in chitwan or hetauda or some other place. I would prefer inner terai than outer terai.