Let's all hope that if AC does go on strike, they will be able to find all those left stranded an alternate means of getting to their destination in a timely fashion. All the majors such as AA, CO, US, DL, NW have flights to YUL (UA codeshares with AC, so forget them). CP will not be on strike, but capacity will surely be bursting at the seams. If memory serves, the last time AC pilots walked off the job, passengers were also re-routed on VIA Rail.
Keeping our fingers crossed!