> Gonna play devil's advocate: shouldn't we wait a generation or something like 10 years to evaluate the situation ?

Cannabis is not a "recent situation" - people have been consuming cannabis since prehistoric times. The cannabis prohibition, on the other hand, is. The country-wide cannabis prohibition started in the United States with the founding of the Federal Bureau of Narcotics in 1930. We did wait three generations to evaluate the situation, it is obvious that the cannabis prohibition has been a complete and total failure causing uncounted damage to lives and communities, and needs to be repealed as soon as possible.