Well, since they sound like they are doing so well, let's see how Oneworld will do without all of CP's domestic routes. Let's say you need to fly YYZ-YVR on Oneworld, the only way is fly AA connect through ORD which is a pain becuase it increases the overall travel time and the dreadful MD-80/90 that AA uses on its domestic routes as compared to CP/AC's J class sometimes with international configuration. Eventually people will move to AC/CP which is Star. Sooner or later, Oneworld will regret for not helping CP.

Regards,
Empress