See the thing is, it's in our blood, the people of South Asia. We don't pay attention to what people are saying, and in last, something very bloody happens. Just look at our history of the last 1200 years.
It's normal actually for me because I see the ground realities first. Let me tell you what is most likely here:
Sindhis at the moment are heavily relying on nationalists like PPP. But how are they achieving "goals"? By killing every possibility of betterment. Today's Sindhi has a job, but he simply has no direction. Urdu speakers will either leave the country or they become new Shoodars of society i.e nothing. Sindhis and their parties when will be done with destroying the progressive part of society, will think what's next? And then will come a part of the society that was unacceptable to the society till then: the Hindus of great dharti Sindh to "save" the great sons of the soil. And then sending Sindhis back to where they came from: villages. But hey, that was the starting point from where Sindhis started by supporting Pakistan in 1943, isn't it?
Hindus, Sikhs, and Muslims. Doesn't matter who rules this soil. It's in our blood, in the very core of our psyche. This cycle will be repeated again and again, till we change ourselves, the way we think, the way we treat others.
And this mentality is not particular with the people of Sindh, it's an overall disease in South Asia.