Minneapolis Ripe for more Craft Breweries?

One thing that I always has on my mind is that Minneapolis needs more breweries.  Obviously, we have a few here in Minnesota, but nowhere near the amount that other similiar sized cities/states have.  There are many Minneapolis Homebrewers, but not very many commercial craft brewers in the metro area.  As evidenced by the demand of Surly, Summit, and Flat Earth, there is more to be had in the Minneapolis area.  Why haven't more of them come to fruition?  What can we, as beer drinkers and homebrewers in Minneapolis, do to demand more top notch craft beer?  Surly is expanding as fast as possible, Summit sales have been on the up and up for years, and Flat Earth is also growing, why hasn't there been more individuals that will step up and take the chance?  What do you think and what would you like to see in the Minneapolis area?