How I see the Metrorail network around RFK Stadium by 2042
I would rather reroute the Blue Line to Forestville as part of GCE Package 1 (this comes shortly after the entire modernization program is finished). Because why only add a 2nd entrance/exit when you can have a total of 4 + a new platform for larger station capacity.
Oklahoma Ave would be built afterwards alongside the Beige Line (a.k.a. Line 10) next.
Speaking of which, the inner DC Loop I proposed as Line 10 (a more Beige-like Gold Line) is just codenamed "Beige" now since the proposed BRT route that the Blue Line follows may be called the Gold Line. Since this is a BRT Route, you might as well revive the Metroway sub-brand and call the route the "Y2" (Route A1X can be renamed Y1) to better fit in with the Better Bus route naming (you can still colour it Gold but don't call it Gold Line as a final name).
Around the Time the Blue Line gets rerouted (again, preferably to Forestville via Georgetown & Union Station), the proposed BRT route can be upgraded to a Tram Line called the "T2" with minimal upgrades if the BRT is built right (T1 if you're wondering would be 7 St/Georgia Ave).