Internal provincial trade restrictions should be wholly and totally done away with. 
I understand the fears of regional actors (politicians, business owners, unionized workers) who push for protectionism to protect jobs & local industries. Their efforts are admirable, but they are unaligned to Canada's strategy to be a free trade knowledge based economy rather than a protectionist labour intensive economy. It's the job of Government at all levels to ensure we follow through on this strategy. It can be done slowly ensuring no one is left behind in the transition. But it needs to be done.