Re: India,Pakistan and Srilanka should united
I repeat, such alliances can be formed only if there is a common minimum basic ideology. Countries like Iran, Pakistan & India are 3 corners of a triangle - more than half the countries you list are not even democracies, which is a basic right of citizens in the 21st century. Trust is possible only where there are similar idelogies. Why/how would a secular democracy like India trust a dictatorship like Pak or a theological state like Iran ?
However, I agree with your point about trade as long as its mutually beneficial without trying to fit it in the structure of a trade alliance.