The problem with going 7-0, or 6-1 for that matter, is that even if the team plays well, it's tough to win every game against decent opponents.
There is a lot of randomness in hockey, and even though the Canucks played very well last night, they only got one point.
It will take a ton of luck to go 6-1. And even then, it only gives the Canucks a 30% chance to make the playoffs.