...you're not going to buy from the dispensary when you can just pick up your pot over the counter at CVS or Safeway. Medicinal marijuana for actual sick people is going to have to become a much more serious and less easygoing process.
I doubt you're ever going to see a framework where you can buy weed at CVS or Safeway -- it's unlikely that major corporations are going to embrace the risk of selling the drug. You're much more likely to see the California/Colorado model, where weed is only available at licensed dispensaries (like how alcohol is only available at liquor stores in some states).
I think weed should be legal, but as a potential future parent, I wouldn't want to have it for sale in a location where I routinely bring my kids to buy aspirin or milk.