I personally do not support Khalistan, but I said, if east Punjab wants to become part of Pakistan, then it can to do so, we would have greater Punjab within Pakistan then.
PS: Also if east Punjab wants independence from India, and the Americans are willing to support them in doing so, then, the Americans would need the help of Pakistan to do so. Of course it is all hypothetical situation..
PS: though I think there might be a possibility, the nations of the west, Pakistan, Afghanistan, and Iran, might eventually want to invade India, like they did before, within 100-200 years, or maybe more. And Punjab may play a vital role in that...
Just a thought.