Walking down 4th Street in Santa Rosa yesterday and passing shop after shop, it crossed my mind that many of these businesses are vulnerable to Amazon. I wouldn’t be surprised if many of them fold in the next few years as Amazon’s tentacles reach out and take them down. High rents, employees and a nearly impossible hurdle to maintain inventory that can compete with Amazon I see as the Achilles Heel of the brick & mortar stores. Just a matter of time.