I think it would be shortsighted of CP to give up one of its most important competitive advantages - which is the recognition, trust and legally sanctioned relationship it has with the homeowner. That relationship is severely compromised if not lost completely with a move to community boxes. 

Rather than abandon that preferred, protected, direct contact with its customers, I'd be looking for ways to leverage it, build on it, monetize it. Address costs through innovation, rationalization and efficiency - including a more realistic, competitive compact with its labour force. But the principal focus should be on growing its market.