Experts around the world are terming it as correction rather then a meltdown. This makes sense as all world economies are in green with the exception of China, we don't really know whats happening in china as the economy news is tightly controlled by state.
Putting it practically, Lets say a small investor with a few crores invested in KSE and suffered big losses during the last few days; Now this investor would need to make up for the losses so he can potentially sell property. The good thing is that the investment funds don't invest that much in property, therefore there is no risk of mass selloff. Personally speaking, i don't think there would be any impact of Stock market activity on property market. PK property market is linked with the overall economy of the country, which is in green as of now.
This can of course change if china crashes(Economy! not stock market), this seems very unlikely as of now.
People suggesting to buy USD: I second that, there is another thing happening in world markets- currency devaluation, again started by China, PKR is bound to be devalued as well(intentionally by PK government to keep exports stable). USD would hold strong.