I don't know how, but for a think tank you are ridiculously ill informed.
Chabahar is not just for Afghanistan. It is a catch all port that India is building that will consolidate India's trade with not just Afghanistan but the entire Central Asian region
upto Turkey.
Narendra Modi government puts Iran's Chabahar port work on fast track - Economic Times
And even if I limit my conversation to Afghanistan, Chabahar provides Afghanistan will a second route to sea.
Till now Afghanistan was totally dependent on Pakistan for its needs, now with Chabahar, Afghanistan will have a second route and it will serve to undercut Afghan dependence on Pakistan and consequently Pakistan's influence on the ability to shape Afghanistan.
Iran has already declared Chabahar zone as a tax free, free trade industrial zone. It will be a confluence for entire South Asia trading with Central Asia. Iran is connecting it with multi-billion dollar trans-central asian highway and rail network that is being built there.
And lastly, Indian companies have already notified their interest to Iran in investing in the Chabahar region to take benefit of tax and produce and export from there.
I agree with your view in that Pakistan should move out of SAARC. It is nothing but dead weight that pulls SAARC down.