I didn't mean all out war on Bretonia, just on the QCP:P
But, all out war on Bretonia would probably cause massive damage to the Bretonians and probably be the last straw for them.
With more Corsair incursions, Kusari inside their borders and now a whole fleet of highly advanced capital warships invading them too, well..It would probably cause a collapse inside Bretonia.
I mean, they are at war with Kusari and barely holding on. With the Corsairs added in AND a whole new well equipped and powerful enemy coming in too?
You get the idea.