Nobody has forced those doctors/engineers to come to canada and work as cabbie. People who has ability has easilybeen  absorbed in job market. most of those people who work in factory, cab etc even though they have foreign degree are not the best and competetive in the job market. If somebody is qualified enough and is competant, they can find the job of their profession, soon or later. It might take some time, but eventually they get settled. I have been in canada for 7 years and have seen many skilled worker easily(?) absorbed in the professional job market. BUT, again the lazy ones........... are stil driving cabs or washing school bus.