Tampa Bay, Philly, Winnipeg, Dallas, LA all didn’t make the playoffs last year.
San Jose hasn’t won a playoff series since their cup run two years ago.
Tampa, Dallas, New York Islanders didn’t win a playoff round last year.
Montreal, Chicago, Calgary, Minnesota haven’t won a playoff series two years in a row.
Los Angeles and Boston haven’t won a playoff series 3 years in a row.
Detroit 4 years in a row.
Toronto 12 years in a row.
There are 10 other teams I haven’t even bothered to list that have had worse drouts than 4 years since a playoff series win.