CP will be a welcome addition to AC. The routes, the aircraft, and profile will all serve to enhance Canada's presence globally.
But most of all, the people. Whatever great or horrible experiences we may have had on AC or CP, the reality is that they are two of the best carriers in the world.
Let us fervently hope that the whole is greater than the sum of its parts. That was certainly the case of the CPAir/Wardair merger. I see no reason why this should not be the case with AC/CP.