You lose your pashtun identity when you lose your pashto and adopt another langauge and culture. Langauge is the important criterea of defining pashtun, but if some non-pashto speaker strongely adheres himself to pashtun qaum and its interests then we gladly welcome them in our folds. But if some one is of pashtun ancestory but doesnt care or feel connected to pashtun qaum...then dont expect us to give a damn about them.
Yahya khan ko gooli maro, wo qizalbash ta, uska hamari qaum sey koi taluq nahi. But there is some connection with ayub khan, but he didnt do any thing regarding educations and progress of pashtuns. Instead he once said that as long as pakhtun is illiterate and backward, there is no danger to integrity of pakistan.
Basically Imran Khan is even less pashtun then Afridi who is even less pashtun then someone from FATA. The difference between you and Afridi, IK is while they are proud of their roots but also considers other Pakistanis as their own. While for you only Afghan pashtuns are your brethen over us. Considering Karachi has become biggest Pashtun city in the world, you are even more worried abour pashto of these people.
Don't you think they would have rather stayed in FATA then moving in to Karachi? After all pure pashto is more important then children future. Or how about integrating FATA with rest of Pakistan? But thats also mean they will stop speaking perfect pashto one day. It seem its you who want pashtuns to stay backward, your ethinic bs is pretty clear now. Pashtuns just like any other ethnicity can't progress without integrating themselves with rest of human beings.