I agree with 9BL regarding the word Bhair Chaal. We buy simply toyota because we consider it status symbol and reliable.
No doubt corolla is reliable but other cars are reliable too and much better then corolla but we are not willing to accept the change. The options we have are City, Nissan, Mitsi, Cheverlet....
Another thing is market penetration. Corolla is in Pakistan Market much before any other brand. Look at india, we wont find any corolla on the roads there.