Welcome to DFI Raja,
Hope you have a good stay.
I would just like to add to one of your posts that Jinnah and the ML never really had any plans for the partition until the 1940s. And Islam was only used as a political tool rather than with any basis of Islam itself when the demand for Pakistan was made.
It is a fact of history that almost all religious clerics who actually followed Islam in their lives opposed the parition precisely because dividing India in the name of religion as Muslim vs Hindu India was completely UnIslamic. Islam in their eyes was a universal faith and not some political ideology that was to be confined within borders of a country. Is it any wonder that the NWFP frontier pathans voted overwhelmingly with the Congress even though slogans like "vote for League if you are Muslim" were being chanted.
However, history was different and people like Jinnah who was muslim only in name and never followed Islam in his personal life used that as a political tool to mobilise Muslim Leaguers, just like Sarvarkar who himself was not a devout Hindu (he was a beef-eater for example) but used Hinduism as a political tool to mobilize Hindu Mahasabhites.
Incidentally both had good personal relations with some people of opposite faiths while advocating hostile positions and mistrust of the opposite community as a whole like supporting the Two Nation Theory.
I guess the bottom line is that while India never supported the Two Nation theory and does not teach it to its kids, Pakistan continues to do so and makes it a cornerstone calling it the ideology of Pakistan. Until this Two Nation Theory is dismantled and a new ideology of Pakistan which accepts that all ethnic groups and all religions are equal citizens of the state as they should be, a dichotomy will remain that will keep destablising Pakistan.
Other than that I would highly recommend reading the book In the Shadow of the Great Game by Narendra Singh Sarila to get a really good undestanding of how the British had interfered in the last years of the independence movements and how they considered the creation of Pakistan as a vital requirements to protect their interests in the wells of power (the persian and arab oil wells) and be a bulwark against USSR. Both of the purposes which Pakistan served to the US/UK regimes.
Once the establishment and the majority of the poeple on both sides understand this reality, I don't see why there would be a reason for both India and Pakistan to work together and have only a border separating us. If UK and France could fight and kill each other for over 500 years and the US and UK fought wars and were hostile to each for 200 years and still became friends. Then India and Pakistan have been apart for 60+ years and theoretically speaking, its not impossible.