Why the Taliban poppy ban was very unlikely to have been sustained after a couple of years

A response to Graham Farrell and John Thorne's "Where Have All the Flowers Gone?: Evaluation of the Taliban Crackdown against Opium Poppy Cultivation in Afghanistan" (2005), which concludes that Taliban enforcement of a ban on opium poppy cultivation was responsible for a reduction in poppy production. The claim is made here that had the Taliban remained in power, it is unlikely that the ban on opium production would have remained in effect. On the one hand, international support for the ban was weak, as even the short-term experience proved. On the other hand, the opium production ban was politically unsustainable over the long term, inasmuch as it placed enormous burdens on Afghan peasants and profited Taliban opponents in Northern Afghanistan. Indeed, the failure of the Taliban to control trafficking as well as production suggests that their concern was more to mitigate the economic effects of an over-supply of heroin than to eliminate opium production permanently.