what you might fail to realize that he is not presenting theory of Pakistan's disintegration but a simple theory of Nationalism vs sub-Nationalism.
I agree that his choice of words should have to be more careful and should have covered topic in bit more depth than a short post, but what he said is not wrong. We may not see what he is stating immediately but in mid to long run you will see this happening.
Just try to recall speeches of Achakzai in all provinces, Maryum attitude towards state, PPP leaning towards (violent) Sindhi Nationalism, JUI politics of mixing religions and race, PTM a fascist organization seeking secession based on false ideology racial supremacy of Afghan attracting former ANP workers so called west inspired anti society elements and Afghan diaspora/ refugees in Pakistan. Constant attempts of foreign players in GB to stroke Right and sub-Nationalist movement
No one other than IK is capable to interact and influence all elements of Pakistani State including common people of all sub-nationalist in all provinces. He is the only one who could inspire youth of every class of Pakistani society.
Now IK is the only Symbol of Pakistani nationalism in current politics of Pakistan.