I think it won't be done for two very simple reasons.
1. Marijuana is one of the largest cash crops in the US. It is big enough to make a significant dent in many State economies, not to mention banks and other financial institutions. Think in terms of what would happen to the farm belt if they lost all their income from wheat and corn.
2. Those currently making money from the WOD would take a pay cut.
The recombinant DNA trick will be done by people who don't care!