The idea that pot legalization will be a major factor in China’s overtaking of America seems pretty hard to consider that seriously. The fundamental issue is how many of our manufacturing jobs they have, how effectively they are building up their military under everyone’s noses, including those who are trusted to keep track of all the nations’ armies and how much of our debt is owed to them. At the moment, the proof is not really there that legalizing weed will lead to a mass decrease in productivity any more than legalizing alcohol did after prohibition. Committed weed users have often been using it anyway regardless of its legality. Many an American between the ages of 18-30 can asses how easy it is to get the stuff even when it is supposedly illegal.
Not to the people who think it is worth living in a police state to prevent people from smoking it.