BBC news channel has continuing issues with budget etc, and trying to provide a full news service for the UK while also relying on world news.
BBC has a large resource to hand, its local news rooms. Could the BBC utilise the local news rooms to provide the evening and part of the overnight schedules?
Surly manchester could do 8-10pm, then maybe the Brum team could provide 11pm?
I mean, it's a nice idea.
However, the way the BBC Newsroom in London works is probably worth a brief reflection. It is not only the News Channel which comes in, not even just network news bulletins, but a whole plethora of outputs (World TV, World Service Radio Stations, Online, Regional Specific Bulletins), and then a complex series of editorial and support functions for outputs such as BBC News Bulletins on Network Radio Stations (such as Radio 2 and 6 Music).
In this sense, the joined up newsroom is able to provide a range of services, across many different (and often unseen) platforms in an effective way. It also allows, for example, a much more effective logistics operation in deploying correspondents, capturing incoming feeds, and arranging a joined-up deployment of resources (including when things go wrong).
By comparison, most regional hubs are designed with quite a specific purpose in mind... trying to get some Regions to join up with their neighbouring Radio Station can be an achievement at times... Arguably, most Regions are overstretched trying to produce local content for either radio or their local TV bulletin - I think the idea of handing a 24 hour operation, on a roving basis, would be a bit too much to ask in some ways.
Of course, your point still stands. How could regional work be used in a national way. There has been various attempts to try and use regional reports (including News 24 Tonight which was designed as a specific way of repackaging regional stuff). Arguably, the Nationwide segment of Afternnoon Live does much the same job, although without reports which are often being worked on the 6:30 bulletins.
Then there is the question of cost. One centralised output does reduce costs, often in unseen ways. The way in which BBC News can use assets and talent across a variety of platforms would be limited if, for example, presenters were being sent up and down the line from Salford, or Brum, or York to cover work -- and we won't get into the whole question of relocation and expenses that became a bit of a torch standard with the move of Breakfast.
The BBC has done a lot to de-centre itself from London. The move of BBC Sport and Breakfast worked, in part, because there was existing infrastructure to support. I'm afraid the same can't be said for relocating a rolling news channel, and all that would be needed to support it, into regional newsrooms.