There are not too many. There are about 16 breweries in the Birmingham metro area. Monday Night Brewing Company and Oak Mountain Brewing Company are opening soon. Asheville has about 30. There are about 85 in the Portland, OR metro area.
More Breweries will mean more clutter to cut through and it will be more important to stand out. Currently local breweries have nice logos and good design. They need to focus on their Brand. Appeal to specific people with specific beliefs. Otherwise, they will be mainly competing on cost. Hoping that they can break through the clutter to have folks sample their beers and experience the quality.