Your understanding is very limited when it comes to Afghan affairs. The present Afghan dispensation installed by western civilization, is nothing more then rebranded northern Alliance minority group, the farsawan, which hates the Pakhtoon in south and to be fair the feeling is mutual. When you say "Afghanistan", as in present day one with present kabul regime, with the background I mentioned, it really doesnt hold much value as such. Taliban being a Pakhtoon movement will , not in million years would work under the northern alliance scumbag. Eventually the Pakhtoon will make their way back to Kabul and once that happen, we in Pakistan will have our influence by default. Charbahar can be made redundant as and when needed. worst come to worse, Taliban who nearly went to war with Iran during their rein over Kabul, got no love for Iran and being strict sunni militia, they actually despise Iran.