This will only create more problems for Afghanistan, not Pakistan. Pakistan's main link to Central Asia is still through China, yes traders might get affected-as a whole it doesn't really affect it but will only create more problems for Afghanistan.
Once CPEC is completed even the small number of traders wouldn't need to bother themselves going through Afghanistan.
Message is to tell Pakistan that Afghanistan can also reply, fail to see how Afghanistan can reply and can it sustain this?
@That Guy , i bet Pakistan government wouldn't even be bothered by it. Why we do continue with this Muslims brothers crap?