Ducks, Sharks, Canadiens, Hawks, Coyotes, Flyers to name 6. Maybe some of the older teams like Washington and Pittsburgh in 2-3 years but doubtful that they'd decline that quickly.
We're talking next year and the 2 years after, not 5+ years down the road. Young teams early in a rebuild that are bad now are not likely to be good overnight. The Flames barely missed the playoffs and have pretty much the same team locked in for a while, the Canucks have been roughly a .500 team and have a young nucleus so they're unlikely to be a bad team.
The Islanders have been a good team for years and now all of a sudden they're going to bottom out with pretty much the same team for....reasons? Nah, not happening.