The corporate tax load on AC is considerably higher than that of emirates. emirates doesnt pay corporate taxes in UAE does it?
That is why the Canadian government doesn't want a low cost international carrier flying into Canada. The Canadian government would take a tax hit to have emirates fly here too much.
Also there isn't a realistic way for AC to compete into Dubai because most of the traffic emirates takes into DXB is thru traffic. AC already covers that Indian market thru it's Star Alliance partners (and AC takes a cut of the ongoing ticket out of ticket from Europe to India - and the Canadian Government takes a tax from that ticket)
If emirates launches out of Vancouver to DXB the Canadian govt doesn't get the same level of tax revenue from that flight. It also gets zero tax revenue for the onward connection to India.
There is no incentive for the Canadian government to allow more EK flights into Canada. There is an incentive to reduce the number of flights EK flies into Canada