LoL.
The Delhi Sultanate which ruled modern day Pakistan(and India) were Turkic with roots in Central Asia. Later in the sixteenth century, Babur came. Babur, the founder of the Mughal empire was a Timurid Turkic prince who came from modern day Uzbekistan. Those who ruled these lands for a thousand years spoke Turkic language in their harems and used Persian as their court language. Urdu itself is a Turkic word, a language which was a mixture of Turkic, Persian, Sansikrat and Arabic. Much of Pakistan's modern culture has borrowed massively from the culture "imposed" by Timurid Turkic Mughals including the language, cuisine and festivals. Kurta and Pajama, Sherwani, Helwa, Pulao, qourma and Kebab originated in Central Asia, not in the Indus Valley. Shalwar qameez was not the dress of the people of the Indus Valley Civilization, it was brought by the Muslims in 13th century. Had our forefathers not borrowed anything at all from those "foreign" cultures, the "sons of soil" or "inheritors" of the Indus Valley Civilization would be wearing white dhotis(read lioncloths) today just like the one that Gandhi wore. Eating burgers and pizzas is OK but if we eat shwarma than all libbus go bonkers and blame us of borrowing Arab culture.
We consider Muhammad PBUH who was an Arab to be our greatest leader, not the local Raja Dahir or Jay Pal. Pakistani culture already has many influences from "outside" including the dominant religion itself (Islam was meant for all of mankind, not just for Arabs alone). That is how cultures evolve. There is no one alive today who proudly follows to the letter what the people of the Indus Valley Civilization did as a part of their "indigenous" culture; not sure what you guys mean when you hammer the term Indus Valley Civilization because that civilization exists no more. The local culture evolved over a period of a thousand years and was influenced heavily by "foreign invaders" who made this place their own land and their own country and shaped its future.
If you ever watch that TV drama Ertugrul, you won't feel any threat to the Pakistani culture at all as it more or less resonates with the cultural, religious and moral values we already uphold; it does not present something which is radical or totally alien to the local Pakistani culture. On the other hand, we would never accept things like Third Wave Feminism, Gay Rights Movements and desensitization of degeneracy which Hollywood and the West promotes (things which Ertugrul bashers also promote and don't think of them as a threat to Pakistani culture). Pakistanis wear jeans and T-shirt, watch bollywood and Indian soap operas in which a man prays to an idol before going to work, watch Hollywood movies which don't reflect our culture at all, if all of that doesn't pose a threat to Pakistani culture then so doesn't Ertugrul.
P.S, last Chief Minister of Sindh and the current one are Syeds(Arab origins). So, you want to exile them to Arabia? People settled from outside in this region throughout history, you cannot disown them because of their Arab or Persian origins.
@Pan-Islamic-Pakistan @Desert Fox