Weren't the Subcontinentians fighting amongst themselves before the British arrived? Sikhs, Muslims, Kashmiris, Punjabis, Pathans, Marhattas, Mughals and Afghans were not chums with each other playing pithu garam and eating cotton candy before the "evil British came and divided us."
The people kept on fighting even during the British rule as well...
This world is not and cannot be the utopia you want it to be. The people of Pakistan and India cannot live in one country in peace and harmony as history of these countries is a testament to that fact; and you want to absorb these three different countries into one - this experiment of yours, if ever carried out, will result in utter ruin for all.
Only if Delhi realized for once and for all that it is better for two irreconcilable ideologies and faiths to live in separate countries than in one, the region will become a better place to live. The world, by and large, for this very reason recognizes the principle of self-determination; unlike some imperialists of Hindustan masquerading as secular egalitarians who want the majority to rule through deception.
That didn't prevent yous from becoming museum relic. Did it?