We shall see. I've been to Amsterdam twice, once in 1999, and once in 2007. In the eight years between visits, I could hardly believe how much the culture had devolved. (Or perhaps my memory had failed, too.) I remembered how laid back and enjoyable the coffee shop atmosphere was in '99, but in '07 it seemed that the whole city was infested by by drunk Brits on a weekend holiday. The character was definitely not the same. When getting high was a nice bonus to the city, it seemed wonderful. When getting high is the point, it is trash. Hopefully, CO and WA will figure out ways of discouraging an out of control culture.
The issue could resolve itself. Amsterdam devolved because those drunk Brits do not have the option back in the UK. Amsterdam would not be so unique if other places with similar lenience were allowed to operate. Pot tourism needs more places like Amsterdam so that a healthy competition can make everyone work harder.