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I wish there were a way to download PDF copies of these maps. The renderings on line are not readable and there are blocks against seeing them at some of the links  I would be happy to pay for access to them.Most of Metro's lines are expandable.  For example, at New Carrollton there is a bumping post after the yard lead.  That track could extend to Bowie some day, possibly out US 50.  The Glenmont could be extended to Olney.  

At the Pentagon, at the outbound end of each level is a tunnel stub for the Columbia Pike line.  It was never built but it was planned.

The WB&A right of way is largely intact in some areas.  Some parts have become rail trails and other parts are just idle.  

The Purple Line could be extended from Bethesda to Georgetown via the same Georgetown Branch line.  From there it would be possible to use the Cabin John trolley right of way through Glover Park to reach P and Q Streets and head to Dupont Circle, as trolleys once did years ago.  

The Rockville trolley right of way is largely intact, although I suspect the private school and the country club located along that line would not appreciate having it revert to rail transit again.  History does repeat itself.  The DC Streetcar runs on the same route as the #10 trolley (Kenilworth to Rosslyn) and the #12 trolley (Seat Pleasant to 15 & New York Avenue).  The proposed line from Calvert Bridge to Anacostia largely duplicates the #92 line to the Navy Yard.  It continues over the 11th Street bridge to Anacostia.  I remember seeing the abandoned conduit tracks on the old 11th Street bridge before it was replaced.  Some pictures of the Knickerbocker Theater disaster of 1922 show cars with two poles at each end.  These used to run to Anacostia.  Hopefully they will not use double overhead wire this time.