Although I am an Indian and i should technically be happy with your proposition...But honestly i defer to your point of view.
Before blaming Pakistan and rest of the world for the unrest, Afganistan has to look into themselves...Do all of the entire nation feel like they are part of the nation?...They have to more sensible..They have to take initiative to bring their country from disaster what it is right now to a normal country....
And regarding giving FATA to Afganistan, it will be suicidal for entire South Asia...FATA and Tribal areas are a country within a country...The militant element withing those triabal areas operate independently....At lest if they are in Pakistan, Pakistan has the might and force and capacity to attack those militants and flush them out, but if it is handed over to Afganistan, it will be nursery of jihadi militant leader through out the world because Afganistan does not have the capacity to control and rein over them...