Rockville Town Square could have been renamed Shutter Island in recent days. Two restaurants have shuttered for good - the ubiquitous Cosi, and the trendy Pho & Rolls. The closure of Cosi is perhaps the more shocking of the two. After all, how often do you see a Starbucks, Panera Bread, or Chipotle close? Although Cosi resided in a quieter, out-of-the-way spot in the town center, the closure does raise questions about whether any other locations of the chain might be under financial pressure to close.