I have a couple of minor predictions:
1. Over the next couple of years in states/localities that have legalized or otherwise reduced penalties for marijuana, there will be a variety of studies (of mixed legitimacy in methodology) that will show an increase in the number of drivers testing positive for cannabis. This will be widely reported.
2. Over the same period of time, those same states/localities will experience a reduction in traffic fatalities. This will be rarely reported, particularly in connection to point 1.
The last two prohibitionist talking points that will remain kicking and screaming, even after the fat lady has sung, will be driving and children.