Detroit, Boston, and Montreal will be pretty bad in a few years.
Bergeron/Krecji/Chara past their primes in Boston, with no clear replacements up front.
Detroit has no one on the back end that's worthy of being a top pair guy, DeKyser is at best a #3, and their best young forward, Larkin, is a #2C.
Montreal laid the foundation to their future mediocrity with the trade of Subban for Weber. Then decided to double down by trading a potential top-end defenseman (Sergachev) for a winger (Drouin). Added an aging, slowing Karl Alzner for 5years in a league that's going more and more towards speed on the back end.
Then they decided to double down on all of it by re-signing a 30year old goalie to an 8yr contract extension...