I think that only applies to interior Sindh and Southern Punjab. Rest of Pakistan does not have a problem with 'zamindars'. Most of the electables are not huge landowners but patriarchs of biradaris and other clan/tribal structures.
And jusy to make ot clear NWFP, Punjab, Balochistan or Sindh would never have been under "Brahmin" servitude for long. Simple maths. With 70% plus majority it would have been the biania who would be at risk. You can even see that in Kashmir with Pandits. Majority always has a impact. Even if ML had never existed our destiny would not be with India.