Totally unrealistic. He doesn't really take into account of history, economic, and socio-economic data.
One example, if Baluchistan was to get its own state, there would be no Pakistan. Instead it would break up and eventually reemerge back to India. For instance, Pakistan punjab would merge back into Indian Punjab.
Afganistan would never be a country but split up into several countries with each country dominated by Pashtuns, Uzbeks, etc.