Good for the BBC governing board and good for Davies. When is the last time we've seen high level leadership take responsibility and resign? It's amazing to see someone show a degree of contrition for mal governance. No doubt GC views added to the chorus, but there should be no doubt that the BBC going after the head of state of the UK's first and foremost ally, and a highly litigious one at that, is the overriding factor.
The BBC is now front and center of an international crisis of its own making, and Trump will be after blood and will be demanding considerable concessions (as he did with CBS which was similarly over a barrel). Davies' situation was untenable, and there will be considerable pain in store for BBC IMO.