People speculate about EU membership while completely forgetting that an individual countries can join individual treaties that effectively form the EU as is.

I am betting the EU will extend the access to EEA to Canada, AU. NZ and possibly Korea and Japan. In all these cases, freedom of movement of people and goods would suffice and is much easier sell to citizens of all countries involved.

Although it's still hard to imagine Canada would align their standards to the EU instead of NA.