This might be compelling for Canadians but I doubt there’s really enough demand from Canadians to sustain this route even seasonally…
…Because I don’t think this will be particularly compelling for Americans. There’s still a flight connection so going via YVR doesn’t offer a sufficient time savings.
Plus there’s strong competition. EVA, China Airlines, JAL, ANA, Korean, Asiana, Cathay Pacific (well, whatever’s left of them), Malaysia, Singapore, others like Philippine Airlines, and some airlines going via Middle East or Europe, all with one-stops to BKK from numerous USA airports, all similar total flight times to going via YVR. (Well OK Singapore and Malaysia are a few hours longer.)
So actually the AC flight enters what looks like quite a crowded field, contrary to the warm and fuzzies in the article.