Stability will be a big win.
And also, hopefully, a performance incentive/penalty system built into the franchise contracts that should improve reliability. In the deregulated system, the only real sanction for failing to operate commercial buses has been the sense of fouling their own financial nest, but that has not been strong enough to prevent prolonged periods (years) of v poor operation. Both GNE and Arriva have been v poor at times from some depots; Stagecoach has seemingly had fewer visible problems, but maybe they hid things better. Even services under contract to Nexus etc have seemingly had their problems (with GCT etc) so fingers crossed for something robust.