Putting this into a perspective of supply and demand is a great way to look at this topic. Demand for the product is strong and has been since our founding forefathers. That won't change. The changes in regulation have been helping it grow in popularity and use (or more demand). As pot laws become less and less strict and more pro than con, the demand will continue to grow. Increasing demand creates value. The more demand increases, the more it will be "okay" to consume. That is going to create even more demand.
The big rush that I posted about was largely due to a large push of demand and a limited amount of supply in terms of retail and warehouse space. Pot shops are competing in a tough retail market and they simply had to get their licenses in place for their dispensaries to have a chance. That suggests that that type of storefront demand most likely won't be sustainable.
However, Supply is highly regulated in Portland in terms of distance from schools and distance from shops being a local requirement. That right there limits the amount of possible supply in the dispensary market. It won't be anything like the coffee market where coffee shops literally operate out of basements and food carts (liquor stores are a good comparison). On top of government regulation you're going to have some property owners that simply will not condone nor lease to a dispensary. Other owners won't because they aren't resourceful enough to find an insurance company willing to insure such a storefront.
The warehouse market has even less supply (Portland has a small fraction of the warehouse space of Seattle, especially industrial space) so the rapid increase in demand has affected that market even more. Unlike other cities Portland simply is not going to build more warehouse space. The industrial land market is probably the tightest market in Portland. There simply isn't enough industrial land suitable for corporate warehouse space. Smart grow operators may be looking to the smaller, less util land, in order to build more, but I don't for see any large contribution on the warehouse supply side of the equation through new construction.
One thing to consider on the supply side is that change in law has slowly allowed supply to become easier and more legal. This has already resulted in retail pot costs being cut roughly in half across the Portland market. The increase in supply and cost to create the supply has already been absorbed in the market place to some extent. Sure more dispensaries will come around and more growers are going to get up and running. But there becomes a point when shops simply won't operate if there isn't any profit.
Demand is going to stay and most likely will increase. Right now supply is chasing that demand and at some point an equilibrium will take place with a leveling of prices and profit margins. Those prices and margins may have already been met or they may go lower.
Most of Oregon hasn't allowed medical dispensaries yet because the state gave the cities the ability to call for a one year moratorium last April. Only a handful (6 I think) of cities allowed implementation right off the bat with Portland, Eugene and Ashland leading the way (no surprise with those 3). The other cities in Oregon are still figuring out how to correctly regulate the dispensaries and grow sites via zoning laws and regulations. That will eventually off set some demand with more supply, which would lead to lower prices and less affect.
The supply side of the equation is still figuring itself out and responding to the large change in demand over the past few years. No one has a crystal ball and can see what is going to happen. However, opportunity to create more income has presented itself. Some are going to take advantage, some already are and some will continue to discount it. None the less, legalization has already affected the Portland market and it has been measurable by the property owners participating in the supply side of the industry.
@Matt R. it sounds as if Northern Cali is going more regulated rather than less regulated. There is so much rural dense land that it may not be a big issue in Northern Cali, but I would imagine a ban on outdoor grow operations would lead to more demand for warehouse space. Portland is such a different place that regulation is going to and has already limited supply. So I think there is will be longer lasting affect on Real Estate here, than you have seen in your area.
Wow, this got really long, sorry for the long post. That's what happens when I start thinking long and hard about supply and demand. The sad brain of an entrepreneur....