Having just read the legal grow in Washington thread It is obvious what lies ahead for California growers as well as just about any other state that goes legal. 200 per pound with named strains grown well all turned to concentrates. The OP in that thread sees the same price for pot as hops which is 20$/#.
Now, I'm not in Cali, and I don't sling wholesale and I really don't know the lay of the land, but I can see the way the wind blows. This thread started with prices in the 4-5K a unit range back in 2011. Now they are down to 1k or less (for the most part) with no sign of a bottom. Evidence says $200/ unit are already in play and California is coming on line with major acreage, at the same time Colorado, Oregon and Washington are pumping out product in abundance.
Not trying to stir a shitstorm, but any discussion of trends and FUTURE pricing will have to include the reality of the situation, which is deflationary in the extreme. I grew gourmet mushrooms indoors on a large scale for many years. At first it was all good prices, support for local growers. niche market, boutique agriculture, but in the end any kitchen manager could order up all the mushrooms they want, looking just as good as mine, grown by corporate farms with unlimited capital to scale up to any need at prices I could not even produce for, much less profit from.
Good luck guys. It's a tough world out there.