The unfortunate reality of Pakistan is that a person has to be of Punjabi descent to be acceptable to the traditional voters of Punjab (who form the bulk of the electorate). Imran Khan is borderline acceptable himself since he was born and raised in Lahore and his hometown is Mianwali which is part of Punjab - even then it took decades of trying to make him acceptable to the wider population. If I recall correctly the only non-Punjabi the Punjabi voter has voted for in great numbers has been ZAB and his daughter.
You think a guy like Shehryar Afridi can be the face of PTI that gets them to win a majority from Punjab? I doubt it. Someone like a Jahangir Tareen has greater chance of being a good choice for PTI, but he isn't much younger than IK himself.