I think you'll see the market reach a lower equilibrium price within a year as novelty consumers drop out of the market.
Also, the higher price is probably serving as a rationing mechanism by lowering the quantity of weed demanded such that only the people who really want it are getting it, thus assuaging the fears of the 'legal->drastically increased consumption crowd'. Yet the state still has a new revenue stream: a win-win.
Finally, since people could easily get a hold of weed from dealers before, I doubt dealer proceeds are suddenly going to go up much, or at all. Rather, the size of their market should stay about the same or otherwise shrink a bit since some of their former customers will be interested in acquiring weed the legal way, even in the face of increased prices.
Oh well, these are what my microeconomic intuitions tell me. Maybe they are complete shit.