It is very unclear McCain’s proposal
and will not add any good to his campaign

With Afghanistan there are two things that can make a difference

1.
Fast switch to a different from oil transportation fuels like methanol and ethanol in USA.

Sooner we achieve this -> less strategic value oil/natural gas will have -> less importance neighboring IRAN and Turkmenistan oil/gas reserves will have.

2.
Change of a drug related policies: possibly legalization of opiates, putting them under governmental control. This may lead to price reduction on heroine and hence Afghanistan opium will not be profitable for Afghan farmers at all

There is one unclear moment here: where is a major market for Afghan opium? I suspect it is Pakistan and India, so it may be more complicated.

But direct military involvement will do nothing if we dont create economical grounds