gorikopoi is absolutely right, had they been there, they'd have completely corrupted the sytem over the course of time. Bhutan accepted them until they started politics, bombblasting and Bhutan knew if they allow them, they would become another Nepal or some rotten country. These very few bhutaness of nepalese origin(of course mostly are indian origin in history) were the most demented criminals who turn to violence to meet their demand. And, all those others had to suffer at the end being refugees thrown out of the country. Though it's bit too much as from human rights perspective bhutan did best for it's interest.
I would like Nepal to be the part of China than India but chances are Nepal will be merged to India because of cultural similarities.
One day, if people are treated well, they'll sing songs for new ruler, that's how the mentality of normal citizens. Before Prithivi Narayan, citizens were under different rulers and they're happily living under their reigns, and unification happened and citizens lived happily living under new reign. If Nepal is merged, and development skyrockets and people are treated well, who the hell will raise the voice against new govt, albeit those few anti-social criminals acting up could not be disregarded