In normal circumstances, yes.
But surely the DfT has power over the franchise operators given that if it terminated the EMA agreements they wouldn't even stick around for 15 days let alone 15 years. I can't see the franchise holders having a lot of real power at this stage. I think many people are underestimating the extent of the fall in passenger numbers and the length of time it will take to recover.
In theory they could protest at being turned into concessions couldn't they?
I bet If someone tells them to paint their trains blue and grey and stick a BR logo on the side with their name in small font underneath, they would do it wouldn't they?
Where did the suggestion about Network Rail come from - was that the Telegraph or Shapps ??
If you read the July Modern Railways, you will see the Treasury wants to know when the railway finances will be back to a sustainable even keel again, with proper cost control.
HMG also doesn't want to see the back of private capital and management in the industry.
That's more important than carving up the railway to suit the crayonistas.
You are also not going to get the regional bodies (TfN etc) to lose their newly-won control over local services, not to mention devolved Wales and Scotland.
The railway is not what it was in 1993 when the break-up started, and you can't just reinvent BR in fancy new colours.
In Germany and France they are heading for a centralised long-distance operation, with locally controlled regional/commuter services, all up for time-limited contracts.
There are many possible models.
The Treasury will go for the one with the lowest annual subsidy, with something more generous in the capital investment sphere.