Canadian airlines have no flights to the Emirates, thus only marginally affected if landing rights had been granted.
Canadian students at the University Complex in Doha, and teachers at two Canadian schools will pay a price-
College of North Atlantic, Qatar campus
University of Calgary School of Nursing, Qatar campus.
Many businessmen, esp. from Ontario and Alberta, will have heavy visa fees (these of course become business expenses deductable from taxes).
Canadian engineering and manufacturing firms, such as Bombardier (airplanes, rail cars, etc.), will be looked upon unfavorably in the Middle East and Arabian peninsula.

A typical case of Canada cutting off its nose.....