They won the friggin' President's Trophy this year. They got eliminated in a series that had two OT games while starting a backup goaltender because a once-in-a-lifetime pandemic prompted their starting goalie and Vezina nominee to walk out on them, while playing in a bubble and having their schedule abruptly changed because of riots. If they got over the Tampa hump, or if the Lightning had choked to Columbus again, they're at least in the finals again and would give Vegas a legit run for the cup. That doesn't strike me as a closed window.
But moving forward from this year will be tough, with Krug leaving the PP will never be the same. However, if they can get Hall and if Studnicka takes a leap in development into a full time NHLer, they'll be right back next year - and will likely run into the Tampa problem again, they don't seem to match up well against that franchise. Bergeron/Marchand/Krejci still have a couple good years left in them. Chara is going to be limited to what he did in the playoffs - defensive zone faceoffs and PK specialist. His days of top pair minutes are done, but he can perform in that new role. The Rask conundrum is going to be key in establishing where this franchise goes forward. Is he back, is he retiring, is he trade bait?