Once the locals have the ablilty to be suitably supplied from a resource that is safe from invaders, they have pretty much got it made from a guerrilla warfare standpoint.
The French in indochina did rather well as long as the contest was trained soldiers against rubber workers with parangs. Once the Soviet Union and China started supplying indochina, the French got their clock cleaned.
Without a reasonable means of interdicting military supplies (which we don't have) or stopping the source (again, I don't think so), we end up with a long guerrilla war which we will probably lose, as long as we try to occupy their country.
As long as we have no use for the land or the occupants, the Carthage treatment is technically feasable. Whether it is necessary or desirable is a different discussion.

-Hugh