i wrote twice and erased because it's really hard to say what Nepal will be in 15 years. it can either go in the direction of development or will move towards destruction.
looking at present situation, I don't have much hope. as long as attitude of political leaders doesn't change, development will remain a dream. all political parties, regardless of their philosophy, are after money and power. noone gives a shit about the country. since last few years, overall situation of the country is going down - more crimes, corruption, pollution (behavioral as well as environmental), unavailability of day-to-day amenities (electricity, petroleum, and more)
if this continues, things will get worse and end in a war - among political parties, between rich and poor, among pahadi and madhesi, among different religious groups, among different ethnic groups.
the key thing is leadership and the one we have is one of the worst in the world. unless we get leaders who are really dedicated to the betterment of people and the country, Nepal will remain undeveloped and maybe will get annexed to India as its part, who knows?

i just wish that Nepal will get a good leadership soon who'll move it towards progress.