We went down on order because of the earth quake that we faced. Anyways, we need to exercise the option for 18 more of the new type and increase our force level for the new type not just the MLU. IMO if PAF wants to carry on with the jet, as it seems to be the case, then they should maintain a force level of atleast 50-60 block 52. India is already multiplying the MKI's, we cannot rely solely on just 18 of these birds. JF-17 will need time to become a mature platform and so is the J-10. They could be used as a force multiplier but not the force itself.
Ice, in my opinion and in terms of an Air Defence deterrence (with its BVR/WVR capability), the MLU offers the same capability as the blk 52. For Strike and Maritime interdiction, the Blk52 is a better solution.