I was looking at the South London options for developing the network
the other day, and it seems to me that the Hayes branch is pretty much
the only option for the DLR, so it should probably go to that, with
the Bakerloo going elsewhere, though going through Lewisham is
probably still a good idea. It'd be a bit unbalanced though, so
extending the Stratford branch up the Lee valley or taking over some
of the metro services of the GEML might prove beneficial....and if it
all gets too busy for a DLR-style service...it can always be upgraded;
after all, the hard work comes from securing the basic alignments.