As someone who rode "bilevel" commuter cars on a daily basis for almost 20 years and Superliner trains since 1997 at least once a year, I'm not sure why so many folks here are so hot to have bilevel long distance equipment. About the only advantage I can see is that the view from the upper level is better. However, this is only for those who get a seat or a room on the upper level. OK, also, I guess the big open luggage rack on the lower level of the Superliners is nice, but that's mainly because it's such a pain in the neck to haul a suitcase up the narrow spiral stairs. Also, if you're on the upper level and hit some rough track, the car sways around like nothing else and feels like it's about ready to tip over. (Yeah, I know, it has a very low center of gravity, and it won't tip, but it sure feels like it will.) I remember one trip on the Capitol Limited out of Chicago, we hit some rough track in Indiana while they were serving dinner, and it was like we were in a tramp steamer plowing through a storm in the North Atlantic.
Also, it seems that the need for stairs in bi-level equipment means that disabled passengers are essentially prisoners in their accommodations. That makes bi-levels essentially a non-starter in the USA because of the Americans with Disabilities Act. I don't know if Canada has similar legislation or regulations, but I would imagine that Canadians are just as interested in improving access for people with disabilities as we are south of the border.