The population of Sikhs is above 50 % and may even be near 60% , the Indian courts recently ruled Sikhs were not a minority in the Punjab. The USA have also said that the India Pakistan border is the most dangerous palce in the world with a Hindu and Muslim country armed nuclear weapons having gone to war several times over the last 60 years, a buffer state could promote peace.
I think the Sikhs as bad as they are would do a much better job than India at ruling ,as even they would not attack the Harimandar Sahib, Burn Sikhs alive and carry out a genocide of religious Sikhs between 1980 and 1995.
Anyway the last time the Sikhs had there state under Marajaha Ranjit Singh it was considered the best run state in Asia.
Kosovo probably has no more than 10% practicing Muslims and they still get Independence
As it was stated above its all about money, political influence in the 'back-yard' of russia and to make the muslim countries around that area happy, i.e. turkey etc. As i said before its a battle of political influence in the area between the USA and Russia, each side is probably doing and influencing events through covert actions. I dont think the USA are as much interested in what happens between Pakistan and India as they now have influence in both countries with recent agreements regarding nuclear armament (they've got both countries in their pockets regarding nuclear weapons and technology now i think).
Im not sure about this as recent news from the area was that both countries are increasing flights between the two countries because of recent peace and friendship between these two countries. And the fact the democratic elections where held in the country and the fact that the UK and USA were heavily influentail in getting back Butto in to the country as well as Nawaz Sharif and to get Musharaf to agree to this