The future is not looking bright for RadioShack at the Cabin John Shopping Center, which is now operating as a “clearance store” carrying only heavily discounted items. All regular-priced merchandise has been shipped out to other locations, and employees say they haven’t been told whether the store will remain open. The Wall Street Journal reports that RadioShack Corp. could file for Chapter 11 bankruptcy protection as early as next week. For now, though, it’s still business as usual at the Rockville Pike and Westfield Montgomery Mall locations — the latter of which is said to be one of the chain’s top performers.