i'm not opposed to that, exactly. canada's immigration system is very different than the american system; these workers have legal protections, that ensure they get minimum wages and minimum benefits. the system could be improved, but the temporary nature of the status is kind of at the root of the problem.
however, i would suggest that the number of new immigrants should consequently be reduced by the amount so that the target remains around 400,000 rather than jumping to over 600,000. that 400,000 is at about replacement (i would still like to see moderate degrowth) and should be a hard limit in which adjustments are made within and not a soft limit that adjustments are made around.