Re: We usually can't buy wine or beer made in another province.
Those laws changed a long time ago and as a result jobs were taken from many provinces to concentrate brewing in Eastern Canada. For example today Molson has only 5 major breweries, all but one in the East. BTW for people outside of Canada more people live in the West than East of Ontario.
If you want to support local jobs you have to buy from the many micro and small breweries. The fact that they also have better beer has resulted in an increase of such breweries and a call to start protecting those jobs. Of course the beer industry, like most Canadian industries is largely foreign owned and controlled so if more trade restrictions between provinces can make them more money they will support such changes.
If changes happen it won't be to protect jobs in most provinces, it will be to increase profits, as all such changes seem to be these days.