I certainly understand your desire to more fully utilize your lovely Canada Place Terminal (i hope I have the name right) and to promote tourism in Vancouver, which is just a beautiful city; I have spent a fair amount of time there and really love it.
I just wonder if there is really enough of a market there from October to April. I see Princess is trying cruises from Vancouver to Hawaii in May and September. Maybe if thsese click you Canadians can try it in other months as well. I am reminded that Princess started with one leased vessel that was a far cry from anything cruising today.
I think it's worth noting, however, that Princess is discontinuing its Mexican Riviera sailings from San Francisco, and while no official reason has been given, it is probably safe to assume that lack of market interest is behind it. I have read several reviews here that have said it is just too far, too cold, and too rough.
But I wish you all the best and fully appreciate your desire to develop a Canadian cruise presence.