catherine mckenna was one of the more capable and well spoken ministers in the trudeau government, and her departure should be seen as both a disappointment and a failure within the pmo. i would have interpreted her as an acceptable potential successor to the prime minister.

when core members start dropping off like that, it's suggestive of a lack of focus in government and evidence that the whole thing is beginning to unravel. in which case, i'd say good riddance to justin trudeau, at the unfortunate expense of his far more capable supporting staff.