With that logic even PML-N and PPP still consider them as mainstream parties but the hard reality is the support of PPP who used to be the dominant party in Punjab was cut down by 95% and the support of PML-N in Sindh is almost non existent.PTI is the only party that has won seats in all provinces and divisions of Pakistan. It had govts in Federal, Punjab and Balochistan before the US backed regime change operation. It still has govts in KPK, Gilgit Baltistan and Azad Kashmir. So stop accusing PTI for not being a national party
Winning couple of seats is not a big deal for big parties but the fact is they are in no position to form majority or have significant impact on the politics of these respective provinces.
The problem with these three big parties is they have accepted the reality and they do not hold enough campaigns outside their stronghold in fear of facing embarrassment if the crowd did not turn. I don’t know if Imran Khan ever visited Dera Bugti, Nawabshah or Larkana when he was the Prime Minister so who cares what he says about these people after he is ousted from power. The same is true for Zardari that he hardly visited Gujranwala or Mustang when he was the President and the same is true for Nawaz Sharif that he did not go anywhere besides Karachi when he was the Premier