With Three fully refurbished Routemasters (Marshall Standard) being
available for the cost of a single modern vehicle it appears sensible to
maximise the Passenger carrying ability of ANY route by retaining them and
distributing them throughout the network as the situation demands.
...
Save the Routemaster Indeed......But only if it remains capable of
performing its task !!

Unfortunately the Routemaster isn't capable of performing the task
required of it - safe and accessible road transport. Routemasters are
not accessible to wheelchairs, buggies or the elderly, and are
extraordinarily unsafe (as demonstrated by the people you occasionally
see trying to push other people off the platform).

Their engines also contribute far more than modern buses to our city's
pollution levels.

They might be cheap, and they might be the subject of some nostalgia,
but they have nevertheless outlived their usefulness.