I know I’m going to catch flack for this but I bet the overall condition of the state will deteriorate as well. Back in the day, I used to have friends that smoed marijuana every day. I could take you to their apartments and my other non-smokers apartments and without saying a word could ask you which was which and there would be no question who was who. Pot makes you letharthic and lazy. I think you are going to see evidence of that manifest itself on a wide scale over time in the state.
I would agree with your observations of users vs. non users. I have also observed that even after quitting the behavior you observed continues. Long lasting personality changes after quitting includes aloof behavior and trouble in relationships. However, I did not comment on the social consequences only the economic consequences. Will the people who predicted the drug trade would decline with pot legalization recant this prediction? I have confident that true libertarian economist will reconsider their model. However, I have no confident that liberals who just wanted to smoke pot will recant on their claims that pot is less harmful that alcohol, thus why I do not engage with liberals.
I too wonder what the new Colorado will be like. It might just stumble along quite well with trust fund babies and those who live off that social scene, with all of the taxes they pay for legal pot. What I wonder is how it's all going to come down when (not if) some kind of natural or man-made crisis happens, and much of the population doesn't cope all that well.