How about Nepal annexing India in Nepal? I mean the name of country is Nepal.

For the common people who does not have political ambition will certainly benefit being part of big country.

Sikkim has one of the highest per capita income in indian states (nominal per capita $4000) while nepal has $600. I do think Nepal can prosper very easily far better than any indian state but looking present leadership and educated nepali peoples false ego and and irrational attitude (Completely controlled by highly corrupt political leaders) I dont see that much hope at least in near future.