So, San Francisco recently did a huge shake-up of their Muni Metro network. (You can see a summary of the changes here: https://www.sfmta.com/blog/big-changes-ahead-when-muni-rail-returns-august)
Their general consolidation of through-routes in the Market Street Subway and slimming down the amount of interlined services through the tunnel, as well as replacing three lines terminating at Embarcadero with just one got me thinking about the rumors of the swap for the and on 53rd Street and 63rd Street. I feel like this should be revisited, especially as ridership picks up again, considering the crowding benefits on the and at Roosevelt Avenue with transfers to/from 63rd Street-bound trains. Of course, the real benefits here come from reducing the bottlenecks at Queens Plaza and 36th Street, which means you'd be able to improve service on the , , , and , just by virtue of cleaning up the merges alone.
Curious as to what you guys think, especially when we now see another fairly large US transit agency reevaluating and changing the way it operates service to use their infrastructure more efficiently.