I think the remaining 10 or so A319s once the 30 transfer to Rouge will stay with AC until the 319/320/321 (E90??) replacement comes along. They use them for several routes which are necessary. As mentioned YYT-LHR needs one, MEX, CCS, and YUL-YVR/LAX etc. AC certainly would have a use for the remaining ones.

2A/C will be here for a while!