If there was anything to the Avro Arrow mess, it was that Canada can't afford that sort of thing. The whole Chalk River site was made with US bomb money, and they have been milking that out for years. We rely on their charity for the bomb-grade uranium. Really, we're over our heads, here.
Now, they might try and make the stuff themselves, by inventing a totally new process. Personally, I don't see them doing it, but they'll think they can, thus sucking money out of Chalk River. Personally, I'm happy to see it shut down, since I think it's a deck of cards on a Seismic Cesspit, but that's just me.