There are too much hate rate for Pakistan specially among Uzbek & Tajik population who constitutes more than 50% of population ... Any such attempts will lead to to the breakup of Afghanistan...
Uzbiks and Tajiks are a minority and are known for making "compromises" when it comes to the majority 59% Pashtuns.
So you're going to give up your sovereignty to the Afghans? If you're using the Durrani as an example it's west taking over the east.
They are our brothers, there is no question of sovereignty, we don't have a border Pakistan and Afghanistan already are a single country with two different names. Pashtuns in Pakistan and Afghanistan share historic ties and feel divided, it will be a win win for both parties. As far as i am concerned its a geo-strategic and geographic inevitability, it may not happen in my life time but it will happen. Not a whole lot of people know about this that we almost had a done deal with King Zahir Shah in the 50s with Liaqat ali khan from our side to establish a unified constitutional monarchy, with a democratic state and Zahir shah would have been the constitutional monarch.
We approached soviets, they wanted a trade off in return for accepting such a union they wanted transit to Karachi which we agreed. They built a steel mill in Karachi, our relations with USSR were warming up and the union with afghanistan was about to become a reality. The Americans found out they didn't want USSR accessing karachi because it would have shifted the economic balance. They asked Bhutto to back off, he refused they supported Gen Zia ul haq to overthrow him, then he was killed. USSR approached Zia in 1978, for the transit, he did what he was hired to do, he refused. USSR got angry and promised to take it by force, 7 months after bhutto was hanged they invaded Afghanistan..Now you know why they REALLY invaded Afghanistan.