I don't see people moving just so that they could smoke weed. It just seems too far fetched.
I agree with the "let's legalize, tax the sh*t out of it, and focus on real crimes" opinion and believe that's what eventually going to happen.
FWIW, here in NYC you can hardly go for a walk anywhere after dark and not smell weed. In ghetto areas (where I go every day) you don't even have to wait for the dark... I often see people just walking down the street with a joint between their teeth, spreading the skunk around. Also as far as I know they stopped arresting people with less than an oz. You just get a fine, a record, and pay for your own college tuition from then on if you're a student. I've met homebrewers who brewed with weed, but I've never been interested in drugs anyway. Alcohol is enough for me so even if it becomes legal I'll be completely indifferent.