I think the larger issue here is that there aren't enough of these companies to hire the best Canada-trained developers on a long term basis; the most talented

I think the larger issue here is that there aren't enough of these companies to hire the best Canada-trained developers on a long term basis; the most talented end up leaving for greener pastures (usually US). When they stay they often choose to work remotely for a foreign company, or locally for a satellite office, rather than contributing more directly to the local economy.