PMLN/PPP/JUI-F/MQM are political wings (front face) of establishment.
These parties dont have any public backing/support, they cant even gather 200 people on streets without bribes and thuggery.
In Punjab by elections, despite use of institutional level record rigging and illegal use of force (Arrest of Shahbaz Gill, workers etc). PTI managed to win 15 out of 20 seats. The score would have been 20/20 if elections were free and fair.
Example of true public support:
-- After the mandate stolen fron PTI on Punjab Assembly elections, in 15 minutes protests started all over the country: Islamabad, Lahore, Peshawar, Sialkot, Hyderabad, Quetta, Karachi everywhere. Most populated city Karachi busiest road Shahrah-e-Faisal was packed with Pakistanis protesting against organized rigging.
PTI is single biggest political party in Pakistan, no other party comes close. It truly represents the sentiments and voice of oppressed commoners.