Air Canada is not exactly an exciting employer right now, but there is still hope. Likely with all the EMB and CRJ's, no new-hires will likely start on a 319-320 for a long time. Those that I know that are still on furlough ( laid off ) will likely be on the CRJ or EMB for 3-5 years and then once all the retirements in 07 and beyond take effect you might see quicker movement, but I wouldn't expect anything significant until 2007-8. Zip is finished, as you correctly mentioned and all the 737's will be gone soon. Sounds like you have lots of time, the average age on the last course at AC was 33, with about 5000 hrs.
Good luck