I think you're right that we can't presume that the spread between Brent prices and WTI will remain. If you look at the last 20 years, it's only relatively recently that they've diverged. In fact, they've been converging again, so there's no guarantee that there'll be a big price savings for consumers in eastern Canada. Having said that, I think it's still worth doing because of Canadian energy security issues, and also for Canadian-based job creation.
The one thing I would add is that both the refinery in Montreal and in New Brunswick are cracking refineries, so from the Alberta Federation of Labour's perspective, we'd still like to send synthetic crude down the pipes eastward, as opposed to raw bitumen. That would have the added benefit of requiring less pipeline space, because in order to ship bitumen you have to dilute it with 30% diluent, which we're increasingly having to import from Saudi Arabia and other world markets. By focusing on raw exports we're in this perverse situation of becoming more dependent on imports of condensate from places like Saudi Arabia.