Which can be resolved by connections on the following routes:
if there genuinely is demand. The common view is that the demand is minimal.
I suppose my theory on whether medium- or long-distance links should have been kept open is: 'if there is a green-signed trunk road [the A6 in this case], there's demand for a through rail route'. Not saying this theory is correct though.
Could tourism have also been a factor in keeping this route alive, with the 'right' service (i.e. a limited-stop service from the cities as suggested above) given it goes right through the Peak District? I still maintain that part of the reason these lines were unprofitable was that they had a poor service - Oxford to Bletchley is perhaps a striking example of this. The theory is "make the service good, and people will use it" - which has been proven in recent times on Chiltern for example, but was not a popular theory at the time of Beeching.