Laos is applying it now, and expects to eliminate the remaining poppy within the next five years. Poppy is virtually gone from Viet Nam. As anticipated by the sceptics, success in eliminating cultivation tended to lead to a displacement effect. This does not mean that alternative development is a failure. I would argue that it is an indicator of its success.
Traffickers go elsewhere to find their raw materials.
If we take a longer view, we can see that they are obliged to go to places that make their work more and more difficult. In Asia, they now rely on Afghanistan for three-quarters of their supply. Most of the remainder comes from Myanmar, the former Burma. China and Central Asia have held firm as a northern wall against the displacement effect. A fairly small portion of the global opium poppy supply comes from Colombia.